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Author SHA1 Message Date
Fortern
13e48717eb 索引 2025-12-02 19:16:41 +08:00
Fortern
5dec90aa2a update 2025-12-02 19:16:31 +08:00
3 changed files with 8 additions and 0 deletions
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3
PostgreSQL/common.sql
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@@ -52,3 +52,6 @@ vacuum full study.r;
-- "(0,2)",3,103 -- "(0,2)",3,103
-- "(0,3)",4,104 -- "(0,3)",4,104
-- 看到空间已经回收 -- 看到空间已经回收
-- 查看数据类型
select pg_typeof(EXTRACT(EPOCH FROM current_timestamp(0)))

2
PostgreSQL/index.sql Normal file
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@@ -0,0 +1,2 @@
-- 不阻塞的情况下创建索引
create index concurrently idx_prism_timestamp on activities (timestamp);

3
PostgreSQL/time.sql
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@@ -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 msg_time at time zone 'UTC+8' from msg where id = 1;
select to_timestamp(1761850339) AT TIME ZONE 'Asia/Shanghai'; 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;