diff --git a/services/statistics-service/deploy/mysql/migrations/003_social_profile_setup_view.sql b/services/statistics-service/deploy/mysql/migrations/003_social_profile_setup_view.sql
index 36a98d8e..8e8a377e 100644
--- a/services/statistics-service/deploy/mysql/migrations/003_social_profile_setup_view.sql
+++ b/services/statistics-service/deploy/mysql/migrations/003_social_profile_setup_view.sql
@@ -56,12 +56,14 @@ WHERE event.app_code IN ('lalu', 'huwaa', 'fami')
   AND event.occurred_at_ms >= @profile_start_from_ms
   AND event.occurred_at_ms < @profile_start_to_ms
 ON DUPLICATE KEY UPDATE
-  user_id = CASE WHEN VALUES(user_id) > 0 THEN VALUES(user_id) ELSE user_id END,
-  device_id = CASE WHEN VALUES(device_id) <> '' THEN VALUES(device_id) ELSE device_id END,
-  country_id = CASE WHEN VALUES(country_id) > 0 THEN VALUES(country_id) ELSE country_id END,
-  region_id = CASE WHEN VALUES(region_id) > 0 THEN VALUES(region_id) ELSE region_id END,
-  profile_setup_view = GREATEST(profile_setup_view, VALUES(profile_setup_view)),
-  updated_at_ms = GREATEST(updated_at_ms, VALUES(updated_at_ms));
+  -- INSERT ... SELECT 的源表和目标表拥有同名列；目标旧值必须显式限定表名，
+  -- 否则 MySQL 会把未限定列判定为 ambiguous，并留下只加列、未回灌的半迁移状态。
+  user_id = CASE WHEN VALUES(user_id) > 0 THEN VALUES(user_id) ELSE stat_social_user_day.user_id END,
+  device_id = CASE WHEN VALUES(device_id) <> '' THEN VALUES(device_id) ELSE stat_social_user_day.device_id END,
+  country_id = CASE WHEN VALUES(country_id) > 0 THEN VALUES(country_id) ELSE stat_social_user_day.country_id END,
+  region_id = CASE WHEN VALUES(region_id) > 0 THEN VALUES(region_id) ELSE stat_social_user_day.region_id END,
+  profile_setup_view = GREATEST(stat_social_user_day.profile_setup_view, VALUES(profile_setup_view)),
+  updated_at_ms = GREATEST(stat_social_user_day.updated_at_ms, VALUES(updated_at_ms));
 
 SELECT ROW_COUNT() AS social_profile_setup_view_backfill_affected_rows;