diff --git a/src/main/java/com/yunhai/homeleave/repository/SysDictRepository.java b/src/main/java/com/yunhai/homeleave/repository/SysDictRepository.java
index dc20609..cd5121b 100644
--- a/src/main/java/com/yunhai/homeleave/repository/SysDictRepository.java
+++ b/src/main/java/com/yunhai/homeleave/repository/SysDictRepository.java
@@ -35,10 +35,15 @@ public interface SysDictRepository extends JpaRepository<SysDict, Integer> {
                                                        @Param("dictType") String dictType,
                                                        @Param("enableFlag") Integer enableFlag);
 
-    /** 可见单条：本校优先，其次全局；同 key 多条时按本校优先 + id 升序，服务侧取首条 */
+    /**
+     * 可见单条：本校优先，其次全局；同 key 多条时按本校优先 + id 升序，服务侧取首条。
+     * <p>排序按「sch_id 是否为空」判定，不写成 {@code case when d.schId = :schId}：where 已限定
+     * 本校或全局，两种写法等价，但在 order by 里再次引用命名参数会触发 Hibernate 参数绑定错位
+     * （Spring Data 只绑 4 个占位符，SQL 有 5 个 → "No value specified for parameter 5"）。</p>
+     */
     @Query("select d from SysDict d where d.dictType = :dictType and d.dictKey = :dictKey " +
             "and (d.schId = :schId or d.schId is null) " +
-            "order by case when d.schId = :schId then 0 else 1 end asc, d.id asc")
+            "order by case when d.schId is null then 1 else 0 end asc, d.id asc")
     List<SysDict> findVisibleBySchIdAndDictTypeAndDictKey(@Param("schId") Integer schId,
                                                           @Param("dictType") String dictType,
                                                           @Param("dictKey") String dictKey);