SQL高手篇:精妙SQL語(yǔ)句介紹

說(shuō)明：復(fù)制表(只復(fù)制結(jié)構(gòu),源表名：a 新表名：b)

　　SQL: select * into b from a where 1<>1 　　

　　說(shuō)明：拷貝表(拷貝數(shù)據(jù),源表名：a 目標(biāo)表名：b)

　　SQL: insert into b(a, b, c) select d,e,f from b; 　　

　　說(shuō)明：顯示文章、提交人和最后回復(fù)時(shí)間

　　SQL: select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table
where table.title=a.title) b 　

　　說(shuō)明：外連接查詢(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 　　

　　說(shuō)明：日程安排提前五分鐘提醒

　　SQL: select * from 日程安排 where datediff('minute',f開(kāi)始時(shí)間,getdate())>5 　　

　　說(shuō)明：兩張關(guān)聯(lián)表，刪除主表中已經(jīng)在副表中沒(méi)有的信息

　　SQL:

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

　　說(shuō)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;&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


　　說(shuō)明：--

　　SQL:

　　select * from studentinfo where not exists(select * from student where
studentinfo.id=student.id) and 系名稱='"&strdepartmentname&"' and 專業(yè)名稱=
'"&strprofessionname&"' order by 性別,生源地,高考總成績(jī)