如何从一位菜鸟蜕变成为高手，灵活使用的[url=http://www.xuebSQL语句是必不可少的。本文收集了部分比较经典，常用的[url=http://www.xuebSQL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)
[url=http://www.xuebSQL: sele[url=http://www.xuebc.com/][color=#810081]c[/color]t * 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)
[url=http://www.xuebSQL: insert into b(a, b, [url=http://www.xuebc.com/][color=#810081]c[/color]) sele[url=http://www.xuebc.com/][color=#810081]c[/color]t d,e,f from b;
说明：显示文章、提交人和最后回复时间
[url=http://www.xuebSQL: sele[url=http://www.xuebc.com/][color=#810081]c[/color]t a.title,a.username,b.adddate from table a,(sele[url=http://www.xuebc.com/][color=#810081]c[/color]t 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)
[url=http://www.xuebSQL: sele[url=http://www.xuebc.com/][color=#810081]c[/color]t a.a, a.b, a.[url=http://www.xuebc.com/][color=#810081]c[/color], b.[url=http://www.xuebc.com/][color=#810081]c[/color], b.d, b.f from a LEFT OUT JOIN b ON a.a = b.[url=http://www.xuebc.com/][color=#810081]c[/color]
说明：日程安排提前五分钟提醒
[url=http://www.xuebSQL: sele[url=http://www.xuebc.com/][color=#810081]c[/color]t * 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
[url=http://www.xuebSQL:
delete from info where not exists ( sele[url=http://www.xuebc.com/][color=#810081]c[/color]t * from infobz where info.infid=infobz.infid
说明：--
[url=http://www.xuebSQL:
SELE[url=http://www.xuebc.com/][color=#810081]C[/color]T A.NUM, A.NAME, B.UPD_DATE, B.PREV_UPD_DATE
FROM TABLE1,
(SELE[url=http://www.xuebc.com/][color=#810081]C[/color]T X.NUM, X.UPD_DATE, Y.UPD_DATE PREV_UPD_DATE
FROM (SELE[url=http://www.xuebc.com/][color=#810081]C[/color]T NUM, UPD_DATE, INBOUND_QTY, STO[url=http://www.xuebc.com/][color=#810081]C[/color]K_ONHAND
FROM TABLE2
WHERE TO_[url=http://www.xuebc.com/][color=#810081]C[/color]HAR(UPD_DATE,'YYYY/MM') = TO_[url=http://www.xuebc.com/][color=#810081]C[/color]HAR(SYSDATE, 'YYYY/MM')) X,
(SELE[url=http://www.xuebc.com/][color=#810081]C[/color]T NUM, UPD_DATE, STO[url=http://www.xuebc.com/][color=#810081]C[/color]K_ONHAND |
