说明:复制表(只复制结构,源表名:a 新表名:b) SQL: select*into b from a where1<>1 说明:拷贝表(拷贝数据,源表名:a 目标表名:b) SQL: insertinto 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 SQL: select a.title,a.username,b.adddate fromtable a,(selectmax(adddate) adddate fromtablewheretable.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 wheredatediff('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: deletefrom info wherenotexists ( 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') ¦¦ '/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 wherenotexists(select*from student where studentinfo.id=student.id) and 系名称='"&strdepartmentname&"'and 专业名称='"&strprofessionname&"'orderby 性别,生源地,高考总成绩 说明: 从数据库中去一年的各单位电话费统计(电话费定额贺电化肥清单两个表来源) SQL: SELECT a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate, 'yyyy') AS telyear, SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '01', a.factration)) AS JAN, SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '02', a.factration)) AS FRI, SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '03', a.factration)) AS MAR, SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '04', a.factration)) AS APR, SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '05', a.factration)) AS MAY, SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '06', a.factration)) AS JUE, SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '07', a.factration)) AS JUL, SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '08', a.factration)) AS AGU, SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '09', a.factration)) AS SEP, SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '10', a.factration)) AS OCT, SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '11', a.factration)) AS NOV, SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '12', a.factration)) ASDEC FROM (SELECT a.userper, a.tel, a.standfee, b.telfeedate, b.factration FROM TELFEESTAND a, TELFEE b WHERE a.tel = b.telfax) a GROUPBY a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate, 'yyyy') 说明:四表联查问题: SQL: select*from a leftinnerjoin b on a.a=b.b rightinnerjoin c on a.a=c.c innerjoin d on a.a=d.d where.. 说明:得到表中最小的未使用的ID号 SQL: SELECT (CASEWHENEXISTS(SELECT*FROM Handle b WHERE b.HandleID =1) THENMIN(HandleID) +1ELSE1END) as HandleID FROM Handle WHERENOT HandleID IN (SELECT a.HandleID -1FROM Handle a)
posted on
2006-06-01 18:00雪无止境
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