diff --git a/PostgreSQL/prism/prism.sql b/PostgreSQL/prism/prism.sql
index ccb9d1d..a83d1c6 100644
--- a/PostgreSQL/prism/prism.sql
+++ b/PostgreSQL/prism/prism.sql
@@ -10,7 +10,8 @@ from activities;
 -- 数据总量
 select max(activity_id) - min(activity_id) + 1
 from activities;
-select count(*) from activities;
+select count(*)
+from activities;
 
 -- 1天内的数据，按action分组排序
 select b.action_id, b.action, count(b.action_id)
@@ -247,3 +248,11 @@ where action_id = (select action_id from actions where action = 'block-form')
   and timestamp > EXTRACT(EPOCH FROM current_timestamp(0))::bigint - 86400 * 1
 group by world_id, x, y, z
 order by count((world_id, x, y, z)) desc;
+
+-- 1天内的 block-form 行为，按时间倒序排序，前500个
+select *
+from activities
+where action_id = (select action_id from actions where action = 'block-form')
+  and timestamp > EXTRACT(EPOCH FROM current_timestamp(0))::bigint - 86400 * 1
+order by timestamp desc
+limit 500;