如何从一位菜鸟蜕变成为高手,灵活使用的sql语句是必不可少的。本文收集了部分比较经典,常用的sql语句供大家参考,希望对大家有所帮助。 说明:复制表(只复制结构,源表名:a 新表名:b) sql: 0select * into b from a where 1<>1 说明:拷贝表(拷贝数据,源表名:a 目标表名:b) sql: insert into b(a, b, c) 0select d,e,f from b. 说明:显示文章、提交人和最后回复时间 sql: 0select a.title,a.username,b.adddate from table a,(0select max(adddate) adddate from table where table.title=a.title) b 说明:外连接查询(表名1:a 表名2:b) sql: 0select a.a, a.b, a.c, b.c, b.d, b.f from a left out join b on a.a = b.c 说明:日程安排提前五分钟提醒 sql: 0select * from 日程安排 where datediff(’minute’,f开始时间,getdate())>5 说明:两张关联表,删除主表中已经在副表中没有的信息 sql: 0delete from info where not exists ( 0select * from infobz where info.infid=infobz.infid 说明:-- sql: 0select a.num, a.name, b.upd_date, b.prev_upd_date from table1, (0select x.num, x.upd_date, y.upd_date prev_upd_date from (0select num, upd_date, inbound_qty, stock_onhand from table2 where to_char(upd_date,’yyyy/mm’) = to_char(sysdate, ’yyyy/mm’)) x, (0select num, upd_date, stock_onhand from table2 where to_char(upd_date,’yyyy/mm’) = to_char(to_date(to_char(sysdate, ’yyyy/mm’) ¦.¦. ’/01’,’yyyy/mm/dd’) - , ’yyyy/mm’) y, where x.num = y.num ( ) and x.inbound_qty nvl(y.stock_onhand,0) <> x.stock_onhand b where a.num = b.num