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

Sql Server ºÍ Access ²Ù×÷Êý¾Ý¿â½á¹¹SqlÓï¾ä

н¨±í£º
create table [±íÃû]
(
[×Ô¶¯±àºÅ×Ö¶Î] int IDENTITY (1,1) PRIMARY KEY ,
[×Ö¶Î1] nVarChar(50) default 'ĬÈÏÖµ' null ,
[×Ö¶Î2] ntext null ,
[×Ö¶Î3] datetime,
[×Ö¶Î4] money null ,
[×Ö¶Î5] int default 0,
[×Ö¶Î6] Decimal (12,4) default 0,
[×Ö¶Î7] image null ,
)
ɾ³ý±í£º
Drop table [±íÃû]
²åÈëÊý¾Ý£º
INSERT INTO [±íÃû] (×Ö¶Î1,×Ö¶Î2) VALUES (100,'51WINDOWS.NET')
ɾ³ýÊý¾Ý£º
DELETE from [±íÃû] WHERE [×Ö¶ÎÃû]>100
¸üÐÂÊý¾Ý£º
UPDATE [±íÃû] SET [×Ö¶Î1] = 200,[×Ö¶Î2] = '51WINDOWS.NET' WHERE [×Ö¶ÎÈý] = 'HAIWA'
ÐÂÔö×ֶΣº
ALTER TABLE [±íÃû] ADD [×Ö¶ÎÃû] NVARCHAR (50) NULL
ɾ³ý×ֶΣº
ALTER TABLE [±íÃû] DROP COLUMN [×Ö¶ÎÃû]
ÐÞ¸Ä×ֶΣº
ALTER TABLE [±íÃû] ALTER COLUMN [×Ö¶ÎÃû] NVARCHAR (50) NULL
ÖØÃüÃû±í£º(Access ²»Ö§³Ö)
EXECUTE sp_rename '±íÃû', 'бíÃû', 'OBJECT'
н¨Ô¼Êø£º
ALTER TABLE [±íÃû] ADD CONSTRAINT Ô¼ÊøÃû CHECK ([Ô¼Êø×Ö¶Î] <= '2000-1-1')
ɾ³ýÔ¼Êø£º
ALTER TABLE [±íÃû] DROP CONSTRAINT Ô¼ÊøÃû
н¨Ä¬ÈÏÖµ
ALTER TABLE [±íÃû] ADD CONSTRAINT ĬÈÏÖµÃû DEFAULT '51WINDOWS.NET' FOR [×Ö¶ÎÃû]
ɾ³ýĬÈÏÖµ
ALTER TABLE [±íÃû] DROP CONSTRAINT ĬÈÏÖµÃû


Ïà¹ØÎĵµ£º

SQLÓÅ»¯ Ë÷Òý

(Ò»)ÉîÈëdz³öÀí½âË÷Òý½á¹¹
¡¡¡¡Êµ¼ÊÉÏ£¬Äú¿ÉÒÔ°ÑË÷ÒýÀí½âΪһÖÖÌØÊâµÄĿ¼¡£Î¢ÈíµÄSQL SERVERÌṩÁËÁ½ÖÖË÷Òý£º¾Û¼¯Ë÷Òý(clustered index£¬Ò²³Æ¾ÛÀàË÷Òý¡¢´Ø¼¯Ë÷Òý)ºÍ·Ç¾Û¼¯Ë÷Òý(nonclustered index£¬Ò²³Æ·Ç¾ÛÀàË÷Òý¡¢·Ç´Ø¼¯Ë÷Òý)¡£ÏÂÃ棬ÎÒÃǾÙÀýÀ´ËµÃ÷һϾۼ¯Ë÷ÒýºÍ·Ç¾Û¼¯Ë÷ÒýµÄÇø±ð£º
¡¡¡¡Æäʵ£¬ÎÒÃǵĺºÓï×ÖµäµÄÕýÎı ......

C#¹Ø¼ü×Ö£º·ÃÎʹؼü×Ö£¨access keyword£©

 C#ÖзÃÎʹؼü×Ö£¨access keyword£©ÓÐÁ½¸ö£ºbase¡¢this
 
1.base
   ÓÃÓÚ´ÓÅÉÉúÀàÖзÃÎÊ»ùÀàµÄ³ÉÔ±£¬°üÀ¨£º
     a.µ÷ÓûùÀàÉÏÒѱ»ÆäËü·½·¨ÖØд£¨override£©µÄ·½·¨¡£
     b.Ö¸¶¨´´½¨ÅÉÉúÀàʵÀýʱӦµ÷ÓõĻùÀ๹Ô캯Êý¡£
  ×¢Ò⣺¶Ô»ùÀàµÄ·ÃÎÊÖ»ÄÜ ......

SQLÅúÁ¿É¾³ý

DECLARE @T varchar(255),
@C varchar(255)
DECLARE Table_Cursor CURSOR FOR
Select
a.name,b.name
from sysobjects a,
syscolumns b
where a.id=b.id and
a.xtype='u' and
(b.xtype=99 or b.xtype=35 or b.xtype=231 or b.xtype=167)
OPEN Table_Cursor
FETCH NEXT from Table_Cursor INTO @T,@C
WHILE(@@FET ......

SQL ServerÓÅ»¯¶þ

1.Ó¦¾¡Á¿±ÜÃâÔÚ where ×Ó¾äÖжÔ×ֶνøÐÐ null ÖµÅжϣ¬·ñÔò½«µ¼ÖÂÒýÇæ·ÅÆúʹÓÃË÷Òý¶ø½øÐÐÈ«±íɨÃ裬È磺
select id from t where num is null
¿ÉÒÔÔÚnumÉÏÉèÖÃĬÈÏÖµ0£¬È·±£±íÖÐnumÁÐûÓÐnullÖµ£¬È»ºóÕâÑù²éѯ£º
select id from t where num=0
2.Ó¦¾¡Á¿±ÜÃâÔÚ where ×Ó¾äÖÐʹÓÃ!=»ò<>²Ù×÷·û£¬·ñÔò½«ÒýÇæ·ÅÆúÊ ......

¹¦ÄÜÇ¿´óµÄSQLÓï¾ä

1. ¸´ÖƱí½á¹¹
Sql´úÂë
   1. select * into B from A where 1=0;   
select * into B from A where 1=0;
 2.¸´ÖƱí¼Ç¼ ¸´ÖÆijЩ×Ö¶Î
Sql´úÂë
   1. insert into B(a, b, c) select d, e, f from A;   
insert into B(a, b, c) select d, e, f from A;
  ¸´Ö ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØͼ | ¸ÓICP±¸09004571ºÅ