diff --git a/PostgreSQL/prism/prism.sql b/PostgreSQL/prism/prism.sql
new file mode 100644
index 0000000..d47bea1
--- /dev/null
+++ b/PostgreSQL/prism/prism.sql
@@ -0,0 +1,11 @@
+-- 获取最新的数据
+select max(timestamp)
+from activities;
+
+-- 1天内的数据，按action分组排序
+select b.action_id, b.action, count(b.action_id)
+from activities as a
+         left join actions as b on a.action_id = b.action_id
+where timestamp > EXTRACT(EPOCH FROM current_timestamp(0))::bigint - 86400
+group by b.action_id, b.action
+order by count(b.action_id) desc;