From 5dec90aa2a6de6c95cae6d0af2a6ae0ee47d5c29 Mon Sep 17 00:00:00 2001
From: Fortern <blueten.ki@gmail.com>
Date: Tue, 2 Dec 2025 19:16:31 +0800
Subject: [PATCH] update

---
 PostgreSQL/common.sql | 3 +++
 PostgreSQL/time.sql   | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/PostgreSQL/common.sql b/PostgreSQL/common.sql
index db96442..97f648b 100644
--- a/PostgreSQL/common.sql
+++ b/PostgreSQL/common.sql
@@ -52,3 +52,6 @@ vacuum full study.r;
 -- "(0,2)",3,103
 -- "(0,3)",4,104
 -- 看到空间已经回收
+
+-- 查看数据类型
+select pg_typeof(EXTRACT(EPOCH FROM current_timestamp(0)))
diff --git a/PostgreSQL/time.sql b/PostgreSQL/time.sql
index 8ee4427..4eea57e 100644
--- a/PostgreSQL/time.sql
+++ b/PostgreSQL/time.sql
@@ -8,3 +8,6 @@ select msg_time at time zone 'Asia/Shanghai' from msg where id = 1;
 select msg_time at time zone 'UTC+8' from msg where id = 1;
 
 select to_timestamp(1761850339) AT TIME ZONE 'Asia/Shanghai';
+
+-- 将当前时间转换为Unix时间戳
+select EXTRACT(EPOCH FROM current_timestamp(0)) - 60;