Ò׽ؽØͼÈí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

SQLÖÐcase whenµÄÁ½ÖÖʹÓ÷½·¨Ê¾Àý

Case¾ßÓÐÁ½ÖÖ¸ñʽ¡£¼òµ¥Caseº¯ÊýºÍCaseËÑË÷º¯Êý¡£
--¼òµ¥Caseº¯Êý
CASE sex
         WHEN '1' THEN 'ÄÐ'
         WHEN '2' THEN 'Å®'
ELSE 'ÆäËû' END
--CaseËÑË÷º¯Êý
CASE WHEN sex = '1' THEN 'ÄÐ'
         WHEN sex = '2' THEN 'Å®'
ELSE 'ÆäËû' END
ÕâÁ½ÖÖ·½Ê½£¬¿ÉÒÔʵÏÖÏàͬµÄ¹¦ÄÜ¡£¼òµ¥Caseº¯ÊýµÄд·¨Ïà¶Ô±È½Ï¼ò½à£¬µ«ÊǺÍCaseËÑË÷º¯ÊýÏà±È£¬¹¦ÄÜ·½Ãæ»áÓÐЩÏÞÖÆ£¬±ÈÈçдÅжÏʽ¡£
»¹ÓÐÒ»¸öÐèҪעÒâµÄÎÊÌ⣬Caseº¯ÊýÖ»·µ»ØµÚÒ»¸ö·ûºÏÌõ¼þµÄÖµ£¬Ê£ÏµÄCase²¿·Ö½«»á±»×Ô¶¯ºöÂÔ¡£
--±ÈÈç˵£¬ÏÂÃæÕâ¶ÎSQL£¬ÄãÓÀÔ¶ÎÞ·¨µÃµ½“µÚ¶þÀà”Õâ¸ö½á¹û
CASE WHEN col_1 IN ( 'a', 'b') THEN 'µÚÒ»Àà'
         WHEN col_1 IN ('a')       THEN 'µÚ¶þÀà'
ELSE'ÆäËû' END
ÏÂÃæÎÒÃÇÀ´¿´Ò»Ï£¬Ê¹ÓÃCaseº¯Êý¶¼ÄÜ×öЩʲôÊÂÇé¡£
Ò»£¬ÒÑÖªÊý¾Ý°´ÕÕÁíÍâÒ»ÖÖ·½Ê½½øÐзÖ×飬·ÖÎö¡£
ÓÐÈçÏÂÊý¾Ý:(ΪÁË¿´µÃ¸üÇå³þ£¬ÎÒ²¢Ã»ÓÐʹÓùú¼Ò´úÂ룬¶øÊÇÖ±½ÓÓùú¼ÒÃû×÷ΪPrimary Key)
¹ú¼Ò£¨country£©    ÈË¿Ú£¨population£©
Öйú    600
ÃÀ¹ú    100
¼ÓÄô󠠠 100
Ó¢¹ú    200
·¨¹ú    300
ÈÕ±¾    250
µÂ¹ú    200
Ä«Î÷¸ç    50
Ó¡¶È    250
¸ù¾ÝÕâ¸ö¹ú¼ÒÈË¿ÚÊý¾Ý£¬Í³¼ÆÑÇÖ޺ͱ±ÃÀÖÞµÄÈË¿ÚÊýÁ¿¡£Ó¦¸ÃµÃµ½ÏÂÃæÕâ¸ö½á¹û¡£
ÖÞ    ÈË¿Ú
ÑÇÖÞ    1100
±±ÃÀÖÞ    250
ÆäËû    700
ÏëÒª½â¾öÕâ¸öÎÊÌ⣬Äã»áÔõô×ö£¿Éú³ÉÒ»¸ö´øÓÐÖÞCodeµÄView£¬ÊÇÒ»¸ö½â¾ö·½·¨£¬µ«ÊÇÕâÑùºÜÄѶ¯Ì¬µÄ¸Ä±äͳ¼ÆµÄ·½Ê½¡£
Èç¹ûʹÓÃCaseº¯Êý£¬SQL´úÂëÈçÏÂ:
SELECT SUM(population),
        CASE country
                WHEN 'Öйú'     THEN 'ÑÇÖÞ'
                WHEN '


Ïà¹ØÎĵµ£º

sql³£ÓÃÓï¾ä

use myoa
select * from
delete from department where departmentid=1
insert Department(DepartmentId,DepartmentName) values(1,'¼¼Êõ²¿')
update Department set departmentname='ÐÅÏ¢¼¼Êõ²¿' where departmentid=1
--ɾ³ý±í
drop table department
--ɾ³ýÊý¾Ý¿â
drop database bai
--ͳ¼ÆÊý¾Ý¿â±íÖмǼ
se ......

sql group by Óë havingµÄÓ÷¨

1. GROUP BY ÊÇ·Ö×é²éѯ, Ò»°ã GROUP BY ÊǺ;ۺϺ¯ÊýÅäºÏʹÓÃ
group by ÓÐÒ»¸öÔ­Ôò,¾ÍÊÇ select ºóÃæµÄËùÓÐÁÐÖÐ,ûÓÐʹÓþۺϺ¯ÊýµÄÁÐ,±ØÐë³öÏÖÔÚ group by ºóÃ棨ÖØÒª£©
ÀýÈç,ÓÐÈçÏÂÊý¾Ý¿â±í£º
A    B
1    abc
1    bcd
1    asdfg
 Èç¹ûÓÐÈ ......

[Sql Server2008]Ê÷½á¹¹µÄµÝ¹éËã·¨

±¾ÎÄÖ÷Òª½²ÊöÈý¸öÄÚÈÝ£º
1.ÈçºÎ´´½¨hierarychyidµÄ±í£¬²åÈëÊý¾Ý¼°»ù±¾µÝ¹é²éѯ¡£
2.½éÉÜhierarchyidµÄ10ÖÖרÓк¯Êý¡£
3.½éÉÜhierarchyidÌØÓеÄÉî¶ÈÓÅÏÈË÷Òý(Depth-First Indexing)ºÍ¹ã¶ÈÓÅÏÈË÷Òý(Breadth-First Indexing)
ÔÚÉÏÒ»½ÚÖÐ
http://blog.csdn.net/tjvictor/archive/2009/07/30/4395677.aspx
ÎÒÃÇÒѾ­ÑÝ ......

ÔÚ°²×°SQL Server2005 ÎÊÌâÐÅÏ¢£º

"SQL Server °²×°³ÌÐòÎÞ·¨»ñÈ¡ ASPNET ÕÊ»§µÄϵͳÕÊ»§ÐÅÏ¢"
½â¾ö°ì·¨£º
ÓÃaspnet_regiisʵÓù¤¾ßжÔغÍÖØа²×°Ò»Ï¾ͿÉÒÔÁË¡£
¾ßÌåµÄ²Ù×÷£º
1¡¢½øÈëCMD£º
C:\windows\microsoft.net\framework\v2.0.50727Îļþ¼ÐÏ£¬ÔËÐÐaspnet_regiis -uжÔØ
È»ºóÔËÐÐaspnet_regiis -i ÖØа²×°£¬ÉÏÊöÎÊÌâ¼´¿É½â¾ö¡£
2¡¢C:\WINDOWS\ ......

Sql°æ±¾³ýÈ¥html²¢½ØÈ¡Ö¸¶¨³¤¶ÈµÄ×Ö·û´®

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
Go
----½ØÈ¡×Ö·û´®£¬²¢³öÈ¥html
create FUNCTION [dbo].[CutString] (@str varchar(1000),@length int) 
RETURNS varchar(1000) AS 
BEGIN
 declare @mainstr varchar(1000)
 declare @substr varchar(1000)
 if(@str is not null or @st ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØͼ | ¸ÓICP±¸09004571ºÅ