diff --git a/apps/server/src/archive/archive.service.ts b/apps/server/src/archive/archive.service.ts
index bca07007..92cae657 100644
--- a/apps/server/src/archive/archive.service.ts
+++ b/apps/server/src/archive/archive.service.ts
@@ -65,6 +65,9 @@ export class ArchiveService {
   /**
    * 解析某条档案子记录属于哪个学生（用于按学生范围做 IDOR 校验）。
    * 找不到返回 null。
+   * 注意：不传 select —— 这些实体带 eager 的 student 关系，TypeORM 0.3.x 对
+   * findOne+select+eager join 会生成缺 id 列的 distinctAlias 子查询而报
+   * ER_BAD_FIELD_ERROR（单行主键查询，全列读取成本可忽略）。
    */
   async resolveRecordStudentId(
     kind: 'enrollment' | 'examScore' | 'learningRecord' | 'attachment',
@@ -72,19 +75,19 @@ export class ArchiveService {
   ): Promise<number | null> {
     switch (kind) {
       case 'enrollment': {
-        const row = await this.enrollmentRepo.findOne({ where: { id }, select: ['studentId'] });
+        const row = await this.enrollmentRepo.findOne({ where: { id } });
         return row?.studentId ?? null;
       }
       case 'examScore': {
-        const row = await this.examScoreRepo.findOne({ where: { id }, select: ['studentId'] });
+        const row = await this.examScoreRepo.findOne({ where: { id } });
         return row?.studentId ?? null;
       }
       case 'learningRecord': {
-        const row = await this.learningRecordRepo.findOne({ where: { id }, select: ['studentId'] });
+        const row = await this.learningRecordRepo.findOne({ where: { id } });
         return row?.studentId ?? null;
       }
       case 'attachment': {
-        const row = await this.attachmentRepo.findOne({ where: { id }, select: ['studentId'] });
+        const row = await this.attachmentRepo.findOne({ where: { id } });
         return row?.studentId ?? null;
       }
       default: