随笔分类 -  SQL

摘要:select (select relname||'--'||(select description from pg_description where objoid=oid and objsubid=0) as comment from pg_class where oid=a.attrelid) as table_name, a.attname as column_name, forma... 阅读全文
posted @ 2019-04-22 10:30 glory.xu 阅读(675) 评论(0) 推荐(0)
摘要:# 创建归档表(只复制表结构和索引) CREATE TABLE Orders_2016 like Orders; # 删除归档表的所有索引(这样可以提高插入速度) # 以前的数据导入归档表 INSERT INTO Orders_2016 SELECT * FROM Orders WHERE date < '2017-01-01'; # 删除原表以前的数据 DELETE FROM My... 阅读全文
posted @ 2017-04-22 16:32 glory.xu 阅读(654) 评论(0) 推荐(0)
摘要:create extension postgres_fdw; create server server_remote_farr foreign data wrapper postgres_fdw options(host '172.16.3.59',port '1921',dbname 'postgres'); create user mapping for android_market ... 阅读全文
posted @ 2016-11-30 14:32 glory.xu 阅读(4644) 评论(2) 推荐(0)
摘要:DECLARE @资产编号 VARCHAR(50) ,@gsid VARCHAR(50) DECLARE test_Cursor CURSOR LOCAL FORSELECT 资产编号,gsid FROM zctempOPEN test_CursorWHILE @@FETCH_STATU... 阅读全文
posted @ 2015-02-11 13:22 glory.xu 阅读(722) 评论(0) 推荐(0)
摘要:原文地址http://blog.csdn.net/shuicaohui5/article/details/63217981. 规定某 字段的数据必须是字母或者数字或者字母alter table 表名 add constraint 约束名 check(字段 like '%[0-9][a-z]%')上边是必须有字母和数字的,你可以加个:or 字段 like '%[0-9]%'or 字段 like '%[a-z]%'2. 时间约束 EndTime不能早于BeginTimeEndTime>BeginTime or EndTime=BeginTime 阅读全文
posted @ 2012-05-25 23:00 glory.xu 阅读(764) 评论(0) 推荐(0)