backend-node/src/services/nodeFlowExecutionService.ts

@@ -2720,28 +2720,48 @@ export class NodeFlowExecutionService {
       const trueData: any[] = [];
       const falseData: any[] = [];
 
-      inputData.forEach((item: any) => {
-        const results = conditions.map((condition: any) => {
+      // 배열의 각 항목에 대해 조건 평가 (EXISTS 조건은 비동기)
+      for (const item of inputData) {
+        const results: boolean[] = [];
+
+        for (const condition of conditions) {
           const fieldValue = item[condition.field];
 
-          let compareValue = condition.value;
-          if (condition.valueType === "field") {
-            compareValue = item[condition.value];
+          // EXISTS 계열 연산자 처리
+          if (
+            condition.operator === "EXISTS_IN" ||
+            condition.operator === "NOT_EXISTS_IN"
+          ) {
+            const existsResult = await this.evaluateExistsCondition(
+              fieldValue,
+              condition.operator,
+              condition.lookupTable,
+              condition.lookupField,
+              context.companyCode
+            );
+            results.push(existsResult);
             logger.info(
-              `🔄 필드 참조 비교: ${condition.field} (${fieldValue}) vs ${condition.value} (${compareValue})`
+              `🔍 EXISTS 조건: ${condition.field} (${fieldValue}) ${condition.operator} ${condition.lookupTable}.${condition.lookupField} => ${existsResult}`
             );
           } else {
-            logger.info(
-              `📊 고정값 비교: ${condition.field} (${fieldValue}) vs ${compareValue}`
+            // 일반 연산자 처리
+            let compareValue = condition.value;
+            if (condition.valueType === "field") {
+              compareValue = item[condition.value];
+              logger.info(
+                `🔄 필드 참조 비교: ${condition.field} (${fieldValue}) vs ${condition.value} (${compareValue})`
+              );
+            } else {
+              logger.info(
+                `📊 고정값 비교: ${condition.field} (${fieldValue}) vs ${compareValue}`
+              );
+            }
+
+            results.push(
+              this.evaluateCondition(fieldValue, condition.operator, compareValue)
             );
           }
-
-          return this.evaluateCondition(
-            fieldValue,
-            condition.operator,
-            compareValue
-          );
-        });
+        }
 
         const result =
           logic === "OR"
@@ -2753,7 +2773,7 @@ export class NodeFlowExecutionService {
         } else {
           falseData.push(item);
         }
-      });
+      }
 
       logger.info(
         `🔍 조건 필터링 결과: TRUE ${trueData.length}건 / FALSE ${falseData.length}건 (${logic} 로직)`
@@ -2768,27 +2788,46 @@ export class NodeFlowExecutionService {
     }
 
     // 단일 객체인 경우
-    const results = conditions.map((condition: any) => {
+    const results: boolean[] = [];
+
+    for (const condition of conditions) {
       const fieldValue = inputData[condition.field];
 
-      let compareValue = condition.value;
-      if (condition.valueType === "field") {
-        compareValue = inputData[condition.value];
+      // EXISTS 계열 연산자 처리
+      if (
+        condition.operator === "EXISTS_IN" ||
+        condition.operator === "NOT_EXISTS_IN"
+      ) {
+        const existsResult = await this.evaluateExistsCondition(
+          fieldValue,
+          condition.operator,
+          condition.lookupTable,
+          condition.lookupField,
+          context.companyCode
+        );
+        results.push(existsResult);
         logger.info(
-          `🔄 필드 참조 비교: ${condition.field} (${fieldValue}) vs ${condition.value} (${compareValue})`
+          `🔍 EXISTS 조건: ${condition.field} (${fieldValue}) ${condition.operator} ${condition.lookupTable}.${condition.lookupField} => ${existsResult}`
         );
       } else {
-        logger.info(
-          `📊 고정값 비교: ${condition.field} (${fieldValue}) vs ${compareValue}`
+        // 일반 연산자 처리
+        let compareValue = condition.value;
+        if (condition.valueType === "field") {
+          compareValue = inputData[condition.value];
+          logger.info(
+            `🔄 필드 참조 비교: ${condition.field} (${fieldValue}) vs ${condition.value} (${compareValue})`
+          );
+        } else {
+          logger.info(
+            `📊 고정값 비교: ${condition.field} (${fieldValue}) vs ${compareValue}`
+          );
+        }
+
+        results.push(
+          this.evaluateCondition(fieldValue, condition.operator, compareValue)
         );
       }
-
-      return this.evaluateCondition(
-        fieldValue,
-        condition.operator,
-        compareValue
-      );
-    });
+    }
 
     const result =
       logic === "OR"
@@ -2797,7 +2836,7 @@ export class NodeFlowExecutionService {
 
     logger.info(`🔍 조건 평가 결과: ${result} (${logic} 로직)`);
 
-    // ⚠️ 조건 노드는 TRUE/FALSE 브랜치를 위한 특별한 처리 필요
+    // 조건 노드는 TRUE/FALSE 브랜치를 위한 특별한 처리 필요
     // 조건 결과를 저장하고, 원본 데이터는 항상 반환
     // 다음 노드에서 sourceHandle을 기반으로 필터링됨
     return {
@@ -2808,6 +2847,68 @@ export class NodeFlowExecutionService {
     };
   }
 
+  /**
+   * EXISTS_IN / NOT_EXISTS_IN 조건 평가
+   * 다른 테이블에 값이 존재하는지 확인
+   */
+  private static async evaluateExistsCondition(
+    fieldValue: any,
+    operator: string,
+    lookupTable: string,
+    lookupField: string,
+    companyCode?: string
+  ): Promise<boolean> {
+    if (!lookupTable || !lookupField) {
+      logger.warn("⚠️ EXISTS 조건: lookupTable 또는 lookupField가 없습니다");
+      return false;
+    }
+
+    if (fieldValue === null || fieldValue === undefined || fieldValue === "") {
+      logger.info(
+        `⚠️ EXISTS 조건: 필드값이 비어있어 ${operator === "NOT_EXISTS_IN" ? "TRUE" : "FALSE"} 반환`
+      );
+      // 값이 비어있으면: EXISTS_IN은 false, NOT_EXISTS_IN은 true
+      return operator === "NOT_EXISTS_IN";
+    }
+
+    try {
+      // 멀티테넌시: company_code 필터 적용 여부 확인
+      // company_mng 테이블은 제외
+      const hasCompanyCode = lookupTable !== "company_mng" && companyCode;
+
+      let sql: string;
+      let params: any[];
+
+      if (hasCompanyCode) {
+        sql = `SELECT EXISTS(SELECT 1 FROM "${lookupTable}" WHERE "${lookupField}" = $1 AND company_code = $2) as exists_result`;
+        params = [fieldValue, companyCode];
+      } else {
+        sql = `SELECT EXISTS(SELECT 1 FROM "${lookupTable}" WHERE "${lookupField}" = $1) as exists_result`;
+        params = [fieldValue];
+      }
+
+      logger.info(`🔍 EXISTS 쿼리: ${sql}, params: ${JSON.stringify(params)}`);
+
+      const result = await query(sql, params);
+      const existsInTable = result[0]?.exists_result === true;
+
+      logger.info(
+        `🔍 EXISTS 결과: ${fieldValue}이(가) ${lookupTable}.${lookupField}에 ${existsInTable ? "존재함" : "존재하지 않음"}`
+      );
+
+      // EXISTS_IN: 존재하면 true
+      // NOT_EXISTS_IN: 존재하지 않으면 true
+      if (operator === "EXISTS_IN") {
+        return existsInTable;
+      } else {
+        return !existsInTable;
+      }
+    } catch (error: any) {
+      logger.error(`❌ EXISTS 조건 평가 실패: ${error.message}`);
+      return false;
+    }
+  }
+
   /**
    * WHERE 절 생성
    */

frontend/components/dataflow/node-editor/nodes/ConditionNode.tsx

@@ -22,6 +22,13 @@ const OPERATOR_LABELS: Record<string, string> = {
   NOT_IN: "NOT IN",
   IS_NULL: "NULL",
   IS_NOT_NULL: "NOT NULL",
+  EXISTS_IN: "EXISTS IN",
+  NOT_EXISTS_IN: "NOT EXISTS IN",
+};
+
+// EXISTS 계열 연산자인지 확인
+const isExistsOperator = (operator: string): boolean => {
+  return operator === "EXISTS_IN" || operator === "NOT_EXISTS_IN";
 };
 
 export const ConditionNode = memo(({ data, selected }: NodeProps<ConditionNodeData>) => {
@@ -54,15 +61,31 @@ export const ConditionNode = memo(({ data, selected }: NodeProps<ConditionNodeDa
                   {idx > 0 && (
                     <div className="mb-1 text-center text-xs font-semibold text-yellow-600">{data.logic}</div>
                   )}
-                  <div className="flex items-center gap-1">
+                  <div className="flex flex-wrap items-center gap-1">
                     <span className="font-mono text-gray-700">{condition.field}</span>
-                    <span className="rounded bg-yellow-200 px-1 py-0.5 text-yellow-800">
+                    <span
+                      className={`rounded px-1 py-0.5 ${
+                        isExistsOperator(condition.operator)
+                          ? "bg-purple-200 text-purple-800"
+                          : "bg-yellow-200 text-yellow-800"
+                      }`}
+                    >
                       {OPERATOR_LABELS[condition.operator] || condition.operator}
                     </span>
-                    {condition.value !== null && condition.value !== undefined && (
-                      <span className="text-gray-600">
-                        {typeof condition.value === "string" ? `"${condition.value}"` : String(condition.value)}
+                    {/* EXISTS 연산자인 경우 테이블.필드 표시 */}
+                    {isExistsOperator(condition.operator) ? (
+                      <span className="text-purple-600">
+                        {(condition as any).lookupTableLabel || (condition as any).lookupTable || "..."}
+                        {(condition as any).lookupField && `.${(condition as any).lookupFieldLabel || (condition as any).lookupField}`}
                       </span>
+                    ) : (
+                      // 일반 연산자인 경우 값 표시
+                      condition.value !== null &&
+                      condition.value !== undefined && (
+                        <span className="text-gray-600">
+                          {typeof condition.value === "string" ? `"${condition.value}"` : String(condition.value)}
+                        </span>
+                      )
                     )}
                   </div>
                 </div>

frontend/components/dataflow/node-editor/panels/properties/ConditionProperties.tsx

@@ -4,14 +4,18 @@
  * 조건 분기 노드 속성 편집
  */
 
-import { useEffect, useState } from "react";
-import { Plus, Trash2 } from "lucide-react";
+import { useEffect, useState, useCallback } from "react";
+import { Plus, Trash2, Database, Search, Check, ChevronsUpDown } from "lucide-react";
 import { Label } from "@/components/ui/label";
 import { Input } from "@/components/ui/input";
 import { Button } from "@/components/ui/button";
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
+import { Command, CommandEmpty, CommandGroup, CommandInput, CommandItem, CommandList } from "@/components/ui/command";
+import { Popover, PopoverContent, PopoverTrigger } from "@/components/ui/popover";
 import { useFlowEditorStore } from "@/lib/stores/flowEditorStore";
-import type { ConditionNodeData } from "@/types/node-editor";
+import type { ConditionNodeData, ConditionOperator } from "@/types/node-editor";
+import { tableManagementApi } from "@/lib/api/tableManagement";
+import { cn } from "@/lib/utils";
 
 // 필드 정의
 interface FieldDefinition {
@@ -20,6 +24,19 @@ interface FieldDefinition {
   type?: string;
 }
 
+// 테이블 정보
+interface TableInfo {
+  tableName: string;
+  tableLabel: string;
+}
+
+// 테이블 컬럼 정보
+interface ColumnInfo {
+  columnName: string;
+  columnLabel: string;
+  dataType: string;
+}
+
 interface ConditionPropertiesProps {
   nodeId: string;
   data: ConditionNodeData;
@@ -38,8 +55,194 @@ const OPERATORS = [
   { value: "NOT_IN", label: "NOT IN" },
   { value: "IS_NULL", label: "NULL" },
   { value: "IS_NOT_NULL", label: "NOT NULL" },
+  { value: "EXISTS_IN", label: "다른 테이블에 존재함" },
+  { value: "NOT_EXISTS_IN", label: "다른 테이블에 존재하지 않음" },
 ] as const;
 
+// EXISTS 계열 연산자인지 확인
+const isExistsOperator = (operator: string): boolean => {
+  return operator === "EXISTS_IN" || operator === "NOT_EXISTS_IN";
+};
+
+// 테이블 선택용 검색 가능한 Combobox
+function TableCombobox({
+  tables,
+  value,
+  onSelect,
+  placeholder = "테이블 검색...",
+}: {
+  tables: TableInfo[];
+  value: string;
+  onSelect: (value: string) => void;
+  placeholder?: string;
+}) {
+  const [open, setOpen] = useState(false);
+
+  const selectedTable = tables.find((t) => t.tableName === value);
+
+  return (
+    <Popover open={open} onOpenChange={setOpen}>
+      <PopoverTrigger asChild>
+        <Button
+          variant="outline"
+          role="combobox"
+          aria-expanded={open}
+          className="mt-1 h-8 w-full justify-between text-xs"
+        >
+          {selectedTable ? (
+            <span className="truncate">
+              {selectedTable.tableLabel}
+              <span className="ml-1 text-gray-400">({selectedTable.tableName})</span>
+            </span>
+          ) : (
+            <span className="text-muted-foreground">테이블 선택</span>
+          )}
+          <ChevronsUpDown className="ml-2 h-3 w-3 shrink-0 opacity-50" />
+        </Button>
+      </PopoverTrigger>
+      <PopoverContent className="w-[300px] p-0" align="start">
+        <Command>
+          <CommandInput placeholder={placeholder} className="h-8 text-xs" />
+          <CommandList>
+            <CommandEmpty className="py-2 text-center text-xs">테이블을 찾을 수 없습니다.</CommandEmpty>
+            <CommandGroup className="max-h-[200px] overflow-y-auto">
+              {tables.map((table) => (
+                <CommandItem
+                  key={table.tableName}
+                  value={`${table.tableLabel} ${table.tableName}`}
+                  onSelect={() => {
+                    onSelect(table.tableName);
+                    setOpen(false);
+                  }}
+                  className="text-xs"
+                >
+                  <Check className={cn("mr-2 h-3 w-3", value === table.tableName ? "opacity-100" : "opacity-0")} />
+                  <div className="flex flex-col">
+                    <span className="font-medium">{table.tableLabel}</span>
+                    <span className="text-[10px] text-gray-500">{table.tableName}</span>
+                  </div>
+                </CommandItem>
+              ))}
+            </CommandGroup>
+          </CommandList>
+        </Command>
+      </PopoverContent>
+    </Popover>
+  );
+}
+
+// 컬럼 선택용 검색 가능한 Combobox
+function ColumnCombobox({
+  columns,
+  value,
+  onSelect,
+  placeholder = "컬럼 검색...",
+}: {
+  columns: ColumnInfo[];
+  value: string;
+  onSelect: (value: string) => void;
+  placeholder?: string;
+}) {
+  const [open, setOpen] = useState(false);
+
+  const selectedColumn = columns.find((c) => c.columnName === value);
+
+  return (
+    <Popover open={open} onOpenChange={setOpen}>
+      <PopoverTrigger asChild>
+        <Button
+          variant="outline"
+          role="combobox"
+          aria-expanded={open}
+          className="mt-1 h-8 w-full justify-between text-xs"
+        >
+          {selectedColumn ? (
+            <span className="truncate">
+              {selectedColumn.columnLabel}
+              <span className="ml-1 text-gray-400">({selectedColumn.columnName})</span>
+            </span>
+          ) : (
+            <span className="text-muted-foreground">컬럼 선택</span>
+          )}
+          <ChevronsUpDown className="ml-2 h-3 w-3 shrink-0 opacity-50" />
+        </Button>
+      </PopoverTrigger>
+      <PopoverContent className="w-[300px] p-0" align="start">
+        <Command>
+          <CommandInput placeholder={placeholder} className="h-8 text-xs" />
+          <CommandList>
+            <CommandEmpty className="py-2 text-center text-xs">컬럼을 찾을 수 없습니다.</CommandEmpty>
+            <CommandGroup className="max-h-[200px] overflow-y-auto">
+              {columns.map((col) => (
+                <CommandItem
+                  key={col.columnName}
+                  value={`${col.columnLabel} ${col.columnName}`}
+                  onSelect={() => {
+                    onSelect(col.columnName);
+                    setOpen(false);
+                  }}
+                  className="text-xs"
+                >
+                  <Check className={cn("mr-2 h-3 w-3", value === col.columnName ? "opacity-100" : "opacity-0")} />
+                  <span className="font-medium">{col.columnLabel}</span>
+                  <span className="ml-1 text-[10px] text-gray-400">({col.columnName})</span>
+                </CommandItem>
+              ))}
+            </CommandGroup>
+          </CommandList>
+        </Command>
+      </PopoverContent>
+    </Popover>
+  );
+}
+
+// 컬럼 선택 섹션 (자동 로드 포함)
+function ColumnSelectSection({
+  lookupTable,
+  lookupField,
+  tableColumnsCache,
+  loadingColumns,
+  loadTableColumns,
+  onSelect,
+}: {
+  lookupTable: string;
+  lookupField: string;
+  tableColumnsCache: Record<string, ColumnInfo[]>;
+  loadingColumns: Record<string, boolean>;
+  loadTableColumns: (tableName: string) => Promise<ColumnInfo[]>;
+  onSelect: (value: string) => void;
+}) {
+  // 캐시에 없고 로딩 중이 아니면 자동으로 로드
+  useEffect(() => {
+    if (lookupTable && !tableColumnsCache[lookupTable] && !loadingColumns[lookupTable]) {
+      loadTableColumns(lookupTable);
+    }
+  }, [lookupTable, tableColumnsCache, loadingColumns, loadTableColumns]);
+
+  const isLoading = loadingColumns[lookupTable];
+  const columns = tableColumnsCache[lookupTable];
+
+  return (
+    <div>
+      <Label className="text-xs text-gray-600">
+        <Search className="mr-1 inline h-3 w-3" />
+        비교할 컬럼
+      </Label>
+      {isLoading ? (
+        <div className="mt-1 rounded border border-dashed bg-gray-50 p-2 text-center text-xs text-gray-400">
+          컬럼 목록 로딩 중...
+        </div>
+      ) : columns && columns.length > 0 ? (
+        <ColumnCombobox columns={columns} value={lookupField} onSelect={onSelect} placeholder="컬럼 검색..." />
+      ) : (
+        <div className="mt-1 rounded border border-dashed bg-gray-50 p-2 text-center text-xs text-gray-400">
+          컬럼 목록을 로드할 수 없습니다
+        </div>
+      )}
+    </div>
+  );
+}
+
 export function ConditionProperties({ nodeId, data }: ConditionPropertiesProps) {
   const { updateNode, nodes, edges } = useFlowEditorStore();
 
@@ -48,6 +251,12 @@ export function ConditionProperties({ nodeId, data }: ConditionPropertiesProps)
   const [logic, setLogic] = useState<"AND" | "OR">(data.logic || "AND");
   const [availableFields, setAvailableFields] = useState<FieldDefinition[]>([]);
 
+  // EXISTS 연산자용 상태
+  const [allTables, setAllTables] = useState<TableInfo[]>([]);
+  const [tableColumnsCache, setTableColumnsCache] = useState<Record<string, ColumnInfo[]>>({});
+  const [loadingTables, setLoadingTables] = useState(false);
+  const [loadingColumns, setLoadingColumns] = useState<Record<string, boolean>>({});
+
   // 데이터 변경 시 로컬 상태 업데이트
   useEffect(() => {
     setDisplayName(data.displayName || "조건 분기");
@@ -55,6 +264,100 @@ export function ConditionProperties({ nodeId, data }: ConditionPropertiesProps)
     setLogic(data.logic || "AND");
   }, [data]);
 
+  // 전체 테이블 목록 로드 (EXISTS 연산자용)
+  useEffect(() => {
+    const loadAllTables = async () => {
+      // 이미 EXISTS 연산자가 있거나 로드된 적이 있으면 스킵
+      if (allTables.length > 0) return;
+
+      // EXISTS 연산자가 하나라도 있으면 테이블 목록 로드
+      const hasExistsOperator = conditions.some((c) => isExistsOperator(c.operator));
+      if (!hasExistsOperator) return;
+
+      setLoadingTables(true);
+      try {
+        const response = await tableManagementApi.getTableList();
+        if (response.success && response.data) {
+          setAllTables(
+            response.data.map((t: any) => ({
+              tableName: t.tableName,
+              tableLabel: t.tableLabel || t.tableName,
+            }))
+          );
+        }
+      } catch (error) {
+        console.error("테이블 목록 로드 실패:", error);
+      } finally {
+        setLoadingTables(false);
+      }
+    };
+
+    loadAllTables();
+  }, [conditions, allTables.length]);
+
+  // 테이블 컬럼 로드 함수
+  const loadTableColumns = useCallback(
+    async (tableName: string): Promise<ColumnInfo[]> => {
+      // 캐시에 있으면 반환
+      if (tableColumnsCache[tableName]) {
+        return tableColumnsCache[tableName];
+      }
+
+      // 이미 로딩 중이면 스킵
+      if (loadingColumns[tableName]) {
+        return [];
+      }
+
+      // 로딩 상태 설정
+      setLoadingColumns((prev) => ({ ...prev, [tableName]: true }));
+
+      try {
+        // getColumnList 반환: { success, data: { columns, total, ... } }
+        const response = await tableManagementApi.getColumnList(tableName);
+        if (response.success && response.data && response.data.columns) {
+          const columns = response.data.columns.map((c: any) => ({
+            columnName: c.columnName,
+            columnLabel: c.columnLabel || c.columnName,
+            dataType: c.dataType,
+          }));
+          setTableColumnsCache((prev) => ({ ...prev, [tableName]: columns }));
+          console.log(`✅ 테이블 ${tableName} 컬럼 로드 완료:`, columns.length, "개");
+          return columns;
+        } else {
+          console.warn(`⚠️ 테이블 ${tableName} 컬럼 조회 실패:`, response);
+        }
+      } catch (error) {
+        console.error(`❌ 테이블 ${tableName} 컬럼 로드 실패:`, error);
+      } finally {
+        setLoadingColumns((prev) => ({ ...prev, [tableName]: false }));
+      }
+      return [];
+    },
+    [tableColumnsCache, loadingColumns]
+  );
+
+  // EXISTS 연산자 선택 시 테이블 목록 강제 로드
+  const ensureTablesLoaded = useCallback(async () => {
+    if (allTables.length > 0) return;
+
+    setLoadingTables(true);
+    try {
+      const response = await tableManagementApi.getTableList();
+      if (response.success && response.data) {
+        setAllTables(
+          response.data.map((t: any) => ({
+            tableName: t.tableName,
+            tableLabel: t.tableLabel || t.tableName,
+          }))
+        );
+      }
+    } catch (error) {
+      console.error("테이블 목록 로드 실패:", error);
+    } finally {
+      setLoadingTables(false);
+    }
+  }, [allTables.length]);
+
   // 🔥 연결된 소스 노드의 필드를 재귀적으로 수집
   useEffect(() => {
     const getAllSourceFields = (currentNodeId: string, visited: Set<string> = new Set()): FieldDefinition[] => {
@@ -170,15 +473,18 @@ export function ConditionProperties({ nodeId, data }: ConditionPropertiesProps)
   }, [nodeId, nodes, edges]);
 
   const handleAddCondition = () => {
-    setConditions([
-      ...conditions,
-      {
-        field: "",
-        operator: "EQUALS",
-        value: "",
-        valueType: "static", // "static" (고정값) 또는 "field" (필드 참조)
-      },
-    ]);
+    const newCondition = {
+      field: "",
+      operator: "EQUALS" as ConditionOperator,
+      value: "",
+      valueType: "static" as "static" | "field",
+      // EXISTS 연산자용 필드는 초기값 없음
+      lookupTable: undefined,
+      lookupTableLabel: undefined,
+      lookupField: undefined,
+      lookupFieldLabel: undefined,
+    };
+    setConditions([...conditions, newCondition]);
   };
 
   const handleRemoveCondition = (index: number) => {
@@ -196,9 +502,50 @@ export function ConditionProperties({ nodeId, data }: ConditionPropertiesProps)
     });
   };
 
-  const handleConditionChange = (index: number, field: string, value: any) => {
+  const handleConditionChange = async (index: number, field: string, value: any) => {
     const newConditions = [...conditions];
     newConditions[index] = { ...newConditions[index], [field]: value };
+
+    // EXISTS 연산자로 변경 시 테이블 목록 로드 및 기존 value/valueType 초기화
+    if (field === "operator" && isExistsOperator(value)) {
+      await ensureTablesLoaded();
+      // EXISTS 연산자에서는 value, valueType이 필요 없으므로 초기화
+      newConditions[index].value = "";
+      newConditions[index].valueType = undefined;
+    }
+
+    // EXISTS 연산자에서 다른 연산자로 변경 시 lookup 필드들 초기화
+    if (field === "operator" && !isExistsOperator(value)) {
+      newConditions[index].lookupTable = undefined;
+      newConditions[index].lookupTableLabel = undefined;
+      newConditions[index].lookupField = undefined;
+      newConditions[index].lookupFieldLabel = undefined;
+    }
+
+    // lookupTable 변경 시 컬럼 목록 로드 및 라벨 설정
+    if (field === "lookupTable" && value) {
+      const tableInfo = allTables.find((t) => t.tableName === value);
+      if (tableInfo) {
+        newConditions[index].lookupTableLabel = tableInfo.tableLabel;
+      }
+      // 테이블 변경 시 필드 초기화
+      newConditions[index].lookupField = undefined;
+      newConditions[index].lookupFieldLabel = undefined;
+      // 컬럼 목록 미리 로드
+      await loadTableColumns(value);
+    }
+
+    // lookupField 변경 시 라벨 설정
+    if (field === "lookupField" && value) {
+      const tableName = newConditions[index].lookupTable;
+      if (tableName && tableColumnsCache[tableName]) {
+        const columnInfo = tableColumnsCache[tableName].find((c) => c.columnName === value);
+        if (columnInfo) {
+          newConditions[index].lookupFieldLabel = columnInfo.columnLabel;
+        }
+      }
+    }
+
     setConditions(newConditions);
     updateNode(nodeId, {
       conditions: newConditions,
@@ -329,64 +676,114 @@ export function ConditionProperties({ nodeId, data }: ConditionPropertiesProps)
                       </Select>
                     </div>
 
-                    {condition.operator !== "IS_NULL" && condition.operator !== "IS_NOT_NULL" && (
+                    {/* EXISTS 연산자인 경우: 테이블/필드 선택 UI (검색 가능한 Combobox) */}
+                    {isExistsOperator(condition.operator) && (
                       <>
                         <div>
-                          <Label className="text-xs text-gray-600">비교 값 타입</Label>
-                          <Select
-                            value={(condition as any).valueType || "static"}
-                            onValueChange={(value) => handleConditionChange(index, "valueType", value)}
-                          >
-                            <SelectTrigger className="mt-1 h-8 text-xs">
-                              <SelectValue />
-                            </SelectTrigger>
-                            <SelectContent>
-                              <SelectItem value="static">고정값</SelectItem>
-                              <SelectItem value="field">필드 참조</SelectItem>
-                            </SelectContent>
-                          </Select>
+                          <Label className="text-xs text-gray-600">
+                            <Database className="mr-1 inline h-3 w-3" />
+                            조회할 테이블
+                          </Label>
+                          {loadingTables ? (
+                            <div className="mt-1 rounded border border-dashed bg-gray-50 p-2 text-center text-xs text-gray-400">
+                              테이블 목록 로딩 중...
+                            </div>
+                          ) : allTables.length > 0 ? (
+                            <TableCombobox
+                              tables={allTables}
+                              value={(condition as any).lookupTable || ""}
+                              onSelect={(value) => handleConditionChange(index, "lookupTable", value)}
+                              placeholder="테이블 검색..."
+                            />
+                          ) : (
+                            <div className="mt-1 rounded border border-dashed bg-gray-50 p-2 text-center text-xs text-gray-400">
+                              테이블 목록을 로드할 수 없습니다
+                            </div>
+                          )}
                         </div>
 
-                        <div>
-                          <Label className="text-xs text-gray-600">
-                            {(condition as any).valueType === "field" ? "비교 필드" : "비교 값"}
-                          </Label>
-                          {(condition as any).valueType === "field" ? (
-                            // 필드 참조: 드롭다운으로 선택
-                            availableFields.length > 0 ? (
-                              <Select
-                                value={condition.value as string}
-                                onValueChange={(value) => handleConditionChange(index, "value", value)}
-                              >
-                                <SelectTrigger className="mt-1 h-8 text-xs">
-                                  <SelectValue placeholder="비교할 필드 선택" />
-                                </SelectTrigger>
-                                <SelectContent>
-                                  {availableFields.map((field) => (
-                                    <SelectItem key={field.name} value={field.name}>
-                                      {field.label || field.name}
-                                      {field.type && <span className="ml-2 text-xs text-gray-400">({field.type})</span>}
-                                    </SelectItem>
-                                  ))}
-                                </SelectContent>
-                              </Select>
-                            ) : (
-                              <div className="mt-1 rounded border border-dashed bg-gray-50 p-2 text-center text-xs text-gray-400">
-                                소스 노드를 연결하세요
-                              </div>
-                            )
-                          ) : (
-                            // 고정값: 직접 입력
-                            <Input
-                              value={condition.value as string}
-                              onChange={(e) => handleConditionChange(index, "value", e.target.value)}
-                              placeholder="비교할 값"
-                              className="mt-1 h-8 text-xs"
-                            />
-                          )}
+                        {(condition as any).lookupTable && (
+                          <ColumnSelectSection
+                            lookupTable={(condition as any).lookupTable}
+                            lookupField={(condition as any).lookupField || ""}
+                            tableColumnsCache={tableColumnsCache}
+                            loadingColumns={loadingColumns}
+                            loadTableColumns={loadTableColumns}
+                            onSelect={(value) => handleConditionChange(index, "lookupField", value)}
+                          />
+                        )}
+
+                        <div className="rounded bg-purple-50 p-2 text-xs text-purple-700">
+                          {condition.operator === "EXISTS_IN"
+                            ? `소스의 "${condition.field || "..."}" 값이 "${(condition as any).lookupTableLabel || "..."}" 테이블의 "${(condition as any).lookupFieldLabel || "..."}" 컬럼에 존재하면 TRUE`
+                            : `소스의 "${condition.field || "..."}" 값이 "${(condition as any).lookupTableLabel || "..."}" 테이블의 "${(condition as any).lookupFieldLabel || "..."}" 컬럼에 존재하지 않으면 TRUE`}
                         </div>
                       </>
                     )}
+
+                    {/* 일반 연산자인 경우: 기존 비교값 UI */}
+                    {condition.operator !== "IS_NULL" &&
+                      condition.operator !== "IS_NOT_NULL" &&
+                      !isExistsOperator(condition.operator) && (
+                        <>
+                          <div>
+                            <Label className="text-xs text-gray-600">비교 값 타입</Label>
+                            <Select
+                              value={(condition as any).valueType || "static"}
+                              onValueChange={(value) => handleConditionChange(index, "valueType", value)}
+                            >
+                              <SelectTrigger className="mt-1 h-8 text-xs">
+                                <SelectValue />
+                              </SelectTrigger>
+                              <SelectContent>
+                                <SelectItem value="static">고정값</SelectItem>
+                                <SelectItem value="field">필드 참조</SelectItem>
+                              </SelectContent>
+                            </Select>
+                          </div>
+
+                          <div>
+                            <Label className="text-xs text-gray-600">
+                              {(condition as any).valueType === "field" ? "비교 필드" : "비교 값"}
+                            </Label>
+                            {(condition as any).valueType === "field" ? (
+                              // 필드 참조: 드롭다운으로 선택
+                              availableFields.length > 0 ? (
+                                <Select
+                                  value={condition.value as string}
+                                  onValueChange={(value) => handleConditionChange(index, "value", value)}
+                                >
+                                  <SelectTrigger className="mt-1 h-8 text-xs">
+                                    <SelectValue placeholder="비교할 필드 선택" />
+                                  </SelectTrigger>
+                                  <SelectContent>
+                                    {availableFields.map((field) => (
+                                      <SelectItem key={field.name} value={field.name}>
+                                        {field.label || field.name}
+                                        {field.type && (
+                                          <span className="ml-2 text-xs text-gray-400">({field.type})</span>
+                                        )}
+                                      </SelectItem>
+                                    ))}
+                                  </SelectContent>
+                                </Select>
+                              ) : (
+                                <div className="mt-1 rounded border border-dashed bg-gray-50 p-2 text-center text-xs text-gray-400">
+                                  소스 노드를 연결하세요
+                                </div>
+                              )
+                            ) : (
+                              // 고정값: 직접 입력
+                              <Input
+                                value={condition.value as string}
+                                onChange={(e) => handleConditionChange(index, "value", e.target.value)}
+                                placeholder="비교할 값"
+                                className="mt-1 h-8 text-xs"
+                              />
+                            )}
+                          </div>
+                        </>
+                      )}
                   </div>
                 </div>
               ))}
@@ -402,20 +799,28 @@ export function ConditionProperties({ nodeId, data }: ConditionPropertiesProps)
         {/* 안내 */}
         <div className="space-y-2">
           <div className="rounded bg-blue-50 p-3 text-xs text-blue-700">
-            🔌 <strong>소스 노드 연결</strong>: 테이블/외부DB 노드를 연결하면 자동으로 필드 목록이 표시됩니다.
+            <strong>소스 노드 연결</strong>: 테이블/외부DB 노드를 연결하면 자동으로 필드 목록이 표시됩니다.
           </div>
           <div className="rounded bg-green-50 p-3 text-xs text-green-700">
-            🔄 <strong>비교 값 타입</strong>:<br />• <strong>고정값</strong>: 직접 입력한 값과 비교 (예: age &gt; 30)
-            <br />• <strong>필드 참조</strong>: 다른 필드의 값과 비교 (예: 주문수량 &gt; 재고수량)
+            <strong>비교 값 타입</strong>:<br />
+            - <strong>고정값</strong>: 직접 입력한 값과 비교 (예: age &gt; 30)
+            <br />- <strong>필드 참조</strong>: 다른 필드의 값과 비교 (예: 주문수량 &gt; 재고수량)
+          </div>
+          <div className="rounded bg-purple-50 p-3 text-xs text-purple-700">
+            <strong>테이블 존재 여부 검사</strong>:<br />
+            - <strong>다른 테이블에 존재함</strong>: 값이 다른 테이블에 있으면 TRUE
+            <br />- <strong>다른 테이블에 존재하지 않음</strong>: 값이 다른 테이블에 없으면 TRUE
+            <br />
+            (예: 품명이 품목정보 테이블에 없으면 자동 등록)
           </div>
           <div className="rounded bg-yellow-50 p-3 text-xs text-yellow-700">
-            💡 <strong>AND</strong>: 모든 조건이 참이어야 TRUE 출력
+            <strong>AND</strong>: 모든 조건이 참이어야 TRUE 출력
           </div>
           <div className="rounded bg-yellow-50 p-3 text-xs text-yellow-700">
-            💡 <strong>OR</strong>: 하나라도 참이면 TRUE 출력
+            <strong>OR</strong>: 하나라도 참이면 TRUE 출력
           </div>
           <div className="rounded bg-yellow-50 p-3 text-xs text-yellow-700">
-            ⚡ TRUE 출력은 오른쪽 위, FALSE 출력은 오른쪽 아래입니다.
+            TRUE 출력은 오른쪽 위, FALSE 출력은 오른쪽 아래입니다.
           </div>
         </div>
       </div>

frontend/types/node-editor.ts

@@ -95,24 +95,35 @@ export interface RestAPISourceNodeData {
   displayName?: string;
 }
 
+// 조건 연산자 타입
+export type ConditionOperator =
+  | "EQUALS"
+  | "NOT_EQUALS"
+  | "GREATER_THAN"
+  | "LESS_THAN"
+  | "GREATER_THAN_OR_EQUAL"
+  | "LESS_THAN_OR_EQUAL"
+  | "LIKE"
+  | "NOT_LIKE"
+  | "IN"
+  | "NOT_IN"
+  | "IS_NULL"
+  | "IS_NOT_NULL"
+  | "EXISTS_IN" // 다른 테이블에 존재함
+  | "NOT_EXISTS_IN"; // 다른 테이블에 존재하지 않음
+
 // 조건 분기 노드
 export interface ConditionNodeData {
   conditions: Array<{
     field: string;
-    operator:
-      | "EQUALS"
-      | "NOT_EQUALS"
-      | "GREATER_THAN"
-      | "LESS_THAN"
-      | "GREATER_THAN_OR_EQUAL"
-      | "LESS_THAN_OR_EQUAL"
-      | "LIKE"
-      | "NOT_LIKE"
-      | "IN"
-      | "NOT_IN"
-      | "IS_NULL"
-      | "IS_NOT_NULL";
+    operator: ConditionOperator;
     value: any;
+    valueType?: "static" | "field"; // 비교 값 타입
+    // EXISTS_IN / NOT_EXISTS_IN 전용 필드
+    lookupTable?: string; // 조회할 테이블명
+    lookupTableLabel?: string; // 조회할 테이블 라벨
+    lookupField?: string; // 조회할 테이블의 비교 필드
+    lookupFieldLabel?: string; // 조회할 테이블의 비교 필드 라벨
   }>;
   logic: "AND" | "OR";
   displayName?: string;