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(xún)(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‘) ¦¦ ‘/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(chēng)=‘"&strdepartmentname&"‘ and 專(zhuān)業(yè)名稱(chēng)=‘"&strprofessionname&"‘ order by 性別,生源地,高考總成績(jī) 說(shuō)明： 從數(shù)據(jù)庫(kù)中去一年的各單位電話費(fèi)統(tǒng)計(jì)(電話費(fèi)定額賀電化肥清單兩個(gè)表來(lái)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)) AS DEC FROM (SELECT a.userper, a.tel, a.standfee, b.telfeedate, b.factration FROM TELFEESTAND a, TELFEE b WHERE a.tel = b.telfax) a GROUP BY a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate, ‘yyyy‘) 說(shuō)明：四表聯(lián)查問(wèn)題： SQL: select * from a left inner join b on a.a=b.b right inner join c on a.a=c.c inner join d on a.a=d.d where ..... 說(shuō)明：得到表中最小的未使用的ID號(hào) SQL: SELECT (CASE WHEN EXISTS(SELECT * FROM Handle b WHERE b.HandleID = 1) THEN MIN(HandleID) + 1 ELSE 1 END) as HandleID FROM Handle WHERE NOT HandleID IN (SELECT a.HandleID - 1 FROM Handle a) |
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