精妙SQL语句介绍

时间:2009-11-05 11:31:16  来源:第二电脑网  作者:第二电脑网

  第二电脑网导读:t d,e,f from b;      说明:显示文章、提交人和最后回复时间 -----www.002pc.com  SQL: select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from tablewhere table.title=a.title) b     说明:外连接查询(表名1:a 表名2:b)   SQL: select a.a, a.b, a.c, b.c, b.d...
  正文:

  说明:复制表(只复制结构,源表名:a 新表名:b)

  SQL: select * 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) select d,e,f from b;   

  说明:显示文章、提交人和最后回复时间 -----www.002pc.com

  SQL: select a.title,a.username,b.adddate from table a,(select 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: select 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: select * 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:

  delete from info where not exists ( select * from infobz where info.infid=infobz.infid )   

  说明:--

  SQL:

  SELECT A.NUM, A.NAME, B.UPD_DATE, B.PREV_UPD_DATE FROM TABLE1,(SELECT X.NUM, X.UPD_DATE,
Y.UPD_DATE PREV_UPD_DATE FROM (SELECT NUM, UPD_DATE, INBOUND_QTY, STOCK_ONHAND FROM TABLE2 WHERE
TO_CHAR(UPD_DATE,'YYYY/MM') = TO_CHAR(SYSDATE, 'YYYY/MM')) X, (SELECT NUM, UPD_DATE, STOCK_ONHAND
FROM TABLE2 WHERE TO_CHAR(UPD_DATE,'YYYY/MM') = TO_CHAR(TO_DATE(TO_CHAR(SYSDATE, 'YYYY/MM')
&brvbar;¦ '/01','YYYY/MM/DD') - 1, '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


  说明:--

  SQL:

  select * from studentinfo where not exists(select * from student where
studentinfo.id=student.id) and 系名称='"&strdepartmentname&"' and 专业名称=
'"&strprofessionname&"' order by 性别,生源地,高考总成绩


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