1 ? 一些有創意的SQL語句
2007-06-16T13:55:31+08:00 | rxl
作為一名programmer,積累代碼是很重要的。下面是我從網上搜集得到的一些精彩的SQL代碼,可以作為平常編寫SQL代碼時做參考之用。
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* 說明:復制表(只復制結構,源表名:a 新表名:b)
select * into b from a where 1<>1
* 說明:拷貝表(拷貝數據,源表名:a 目標表名:b)
insert into b(a, b, c) select d,e,f from b;
* 說明:顯示文章、提交人和最後回復時間
select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table where table.title=a.title) b
* 說明:外連接查詢(表名1:a 表名2:b)
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
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信息
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:--