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

ÓÃSQLÓï¾äÐÞ¸ÄSQL±í½á¹¹

×î½üÐÞ¸ÄÊý¾Ý¿âÒѾ­´æÔڵıí½á¹¹£¬·¢ÏÖÓÃSQLÓï¾äÄܺܺõÄÐ޸ıíµÄ½á¹¹¡£SQLÊý¾Ý¿â¼Ç¼Êý·Ç³£ÅÓ´ó£¬Èç¹ûÏëÐ޸ıíµÄ×Ö¶ÎÀàÐÍ£¬Ê¹ÓÃÆóÒµ¹ÜÀíÆ÷À´¸ü¸Ä×Ö¶ÎÀàÐÍ£¬ºÜ¶àʱºò»á³¬Ê±£¬¸ü¸Ä²»³É¹¦£¬Õâ¸öʱºò£¬¿ÉÒÔÓÃSQLÓï¾äÀ´¸ü¸Ä£¬ÒÔÏÂΪÏàÓ¦µÄ´úÂëʵÀý£º
1.¸ü¸Ä×Ö¶ÎÀàÐͳ¤¶È
alert table ±í alert column ×Ö¶ÎÃû ÀàÐ͵ij¤¶È
eg: alter table users alter column IDcard char(20)
2.¸ü¸Ä×Ö¶ÎÀàÐÍ
alert table ±í alert column ×Ö¶ÎÃû ¸ü¸ÄºóµÄÀàÐÍ
eg:°Ñ³ÇÊбíµÄ³ÇÊÐÃû×Ö¶ÎÓÉÔ­À´µÄvarchar¸Ä³Éint
alert table testcity alter column cityname int
3.Ìí¼Ónot nullÔ¼Êø
alert table ±íalert column ×Ö¶ÎÃû int not null
4.ÉèÖÃÖ÷¼ü
alert table ±í add constraint Ö÷¼üÃû primary key(×Ö¶ÎÃû)
5.¸ü¸Ä×Ö¶ÎÃû
EXEC sp_name '±íÃû.×Ö¶ÎÃû‘£¬¸ü¸ÄºóµÄ×Ö¶ÎÃû£¬’COLUMN‘
6.Ìí¼Ó×Ö¶ÎÃû
alert table ±í add ×Ö¶ÎÃû ×Ö¶ÎÀàÐÍ default null


Ïà¹ØÎĵµ£º

sql ²éѯÌõ¼þ×Ö¶ÎΪtext»òntext µÄ½â¾ö·½°¸

sql ²éѯÌõ¼þ×Ö¶ÎΪtext»òntextµÃ½â¾ö·½°¸ÒÔ¼°varchar(max)¡¢nvarchar(max)
1¡¢ÔÚMS SQL2005¼°ÒÔÉϵİ汾ÖУ¬¼ÓÈë´óÖµÊý¾ÝÀàÐÍ£¨varchar(max)¡¢nvarchar(max)¡¢varbinary(max) £©¡£´óÖµÊý¾ÝÀàÐÍ×î¶à¿ÉÒÔ´æ´¢2^30-1¸ö×Ö½ÚµÄÊý¾Ý¡£
Õ⼸¸öÊý¾ÝÀàÐÍÔÚÐÐΪÉϺͽÏСµÄÊý¾ÝÀàÐÍ varchar¡¢nvarchar ºÍ varbinary Ïàͬ¡£
΢ÈíµÄË ......

SQL Server bcp

D:\projects\openi\misc\xxxx_data_20090828>bcp [xxxxolap].[dbo].[wdb_cxbz]  in wdb_xxx.txt      -c -T
SQLState = 37000, NativeError = 4060
Error = [Microsoft][SQL Server Native Client 10.0][SQL Server]Cannot open database "xxxolap" requested by the login. The login failed.
S ......

ÈýÖÖSQL·ÖÒ³·½Ê½


1.·ÖÒ³·½°¸Ò»£º(ÀûÓÃNot InºÍSELECT TOP·ÖÒ³)
¡¡¡¡Óï¾äÐÎʽ£º
SELECTTOP10*fromTestTableWHERE(IDNOTIN¡¡¡¡¡¡¡¡¡¡(SELECTTOP20id¡¡¡¡¡¡¡¡fromTestTable¡¡¡¡¡¡¡¡ORDERBYid))ORDERBYIDSELECTTOPÒ³´óС*fromTestTableWHERE(IDNOTIN¡¡¡¡¡¡¡¡¡¡(SELECTTOPÒ³´óС*Ò³Êýid¡¡¡¡¡¡¡¡from±í¡¡¡¡¡¡¡¡ORDERBYid))ORDERBYID
¡¡¡¡2.·Ö ......

¹ØÓÚʱ¼ä¶ÎµÄSQL£¨Orcale¡¢SQL Server£©²éѯ

Ò»¡¢Orcale ʱµÄ²éѯ
String hql = "from SmsTemplate t where 1=1 ";
 if (model != null && !"".equals(model.getEndTimes())&& null!=model.getEndTimes() ) {
   SimpleDateFormat dateFm = new SimpleDateFormat("yyyy-MM-dd"); //¸ñʽ»¯µ±Ç°ÏµÍ³ÈÕÆÚ
   Date ......

³¬¼¶ÓÐÓõÄSQLÓï¾ä(·ÖÎöSQL SERVER Êý¾Ý¿â±í½á¹¹×¨ÓÃ)

³¬¼¶ÓÐÓõÄSQLÓï¾ä £¨ÓÃÓÚSQL SERVER ·þÎñÆ÷£©
³¬¼¶ÓÐÓõÄSQLÓï¾ä £¬Ö´Ðк󷵻صÄÁзֱðÊÇ£º±íÃû¡¢ÁÐÃû¡¢ÁÐÀàÐÍ¡¢Áг¤¶È¡¢ÁÐÃèÊö¡¢ÊÇ·ñÖ÷¼ü£¬Óï¾äÈçÏ£º
(·ÖÎöSQL SERVER Êý¾Ý¿â±í½á¹¹×¨ÓÃ)
Select Sysobjects.Name As ±íÃû,
       Syscolumns.Name As ÁÐÃû,
     ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØͼ | ¸ÓICP±¸09004571ºÅ