精妙SQL語句 (轉)

精妙SQL語句 (轉)[@more@]

詳細的請看原貼 ^_^

說明：複製表(只複製結構,源表名：a 新表名：b)
: * into b from a where 1<>1

說明：複製表(複製資料,源表名：a 目標表名：b)
SQL: insert into b(a, b, c) select d,e,f from b;

說明：顯示文章、提交人和最後回覆時間
SQL: select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table where table.title=a.title) b

說明：外連線查詢(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

說明：日程安排提前五分鐘提醒
SQL:  select * from 日程安排 where datediff('minute',f開始時間,getdate())>5

說明：兩張關聯表，刪除主表中已經在副表中沒有的資訊
SQL: 
delete from info where not exists ( select * from infobz where info.infid=infobz.infid )

說明：--
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

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

說明：
從中去一年的各單位電話費統計(電話費定額賀電化肥清單兩個表來源）
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')

說明：四表聯查問題：
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 .....

說明：得到表中最小的未使用的ID號
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)