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精妙SQL语句精华
2016-05-12 16:15:42           
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  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

  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’) ¦¦ ‘/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

  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)) 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’)

  说明:四表联查问题:

  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 …..

  说明:得到表中最小的未使用的ID号

  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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