SQL¸½¼ÓÊý¾Ý¿âºó,Êý¾Ý¿âÊÇÖ»¶ÁµÄ
·½·¨Ò»
1.н¨Ò»¸öͬÃûµÄÊý¾Ý¿â
2.ÔÙÍ£µôsql server(×¢Òâ²»Òª·ÖÀëÊý¾Ý¿â)
3.ÓÃÔÊý¾Ý¿âµÄÊý¾ÝÎļþ¸²¸ÇµôÕâ¸öн¨µÄÊý¾Ý¿â
4.ÔÙÖØÆôsql server
5.´Ëʱ´ò¿ªÆóÒµ¹ÜÀíÆ÷ʱ»á³öÏÖÖÃÒÉ£¬ÏȲ»¹Ü£¬Ö´ÐÐÏÂÃæµÄÓï¾ä£¨×¢ÒâÐÞ¸ÄÆäÖеÄÊý¾Ý¿âÃû)
6.Íê³ÉºóÒ»°ã¾Í¿ÉÒÔ·ÃÎÊÊý¾Ý¿âÖеÄÊý¾ÝÁË,Õâʱ,Êý¾Ý¿â±¾ÉíÒ»°ã»¹ÒªÎÊÌâ,½â¾ö°ì·¨ÊÇ,ÀûÓÃ
Êý¾Ý¿âµÄ½Å±¾´´½¨Ò»¸öеÄÊý¾Ý¿â,²¢½«Êý¾Ýµ¼½øÈ¥¾ÍÐÐÁË.
USE MASTER
GO
SP_CONFIGURE 'ALLOW UPDATES',1 RECONFIGURE WITH OVERRIDE
GO
UPDATE SYSDATABASES SET STATUS =32768 WHERE NAME='ÖÃÒɵÄÊý¾Ý¿âÃû'
Go
sp_dboption 'ÖÃÒɵÄÊý¾Ý¿âÃû', 'single user', 'true'
Go
DBCC CHECKDB('ÖÃÒɵÄÊý¾Ý¿âÃû')
Go
update sysdatabases set status =28 where name='ÖÃÒɵÄÊý¾Ý¿âÃû'
Go
sp_configure 'allow updates', 0 reconfigure with override
Go
sp_dboption 'ÖÃÒɵÄÊý¾Ý¿âÃû', 'single user', 'false'
Go
 
Ïà¹ØÎĵµ£º
SQL SERVER 2008 ¸ü¸Ä¸ú×Ù
/*
¿´Ê飬¿´Áª»úÆÚ¼ä¡£¡£¡£Ë³´ø°Ñ¿´µ½µÄдÏÂ
ÓëSQL SERVER 2008 CDC Òì²½²¶»ñÊý¾Ý±ä¸üµÄ²»Í¬,¸ü¸Ä¸ú×ÙÊÇͬ²½½ø³Ì,
ÊÇDML(INSERT/UPDATE/DELETE)ÊÂÎñµÄÒ»²¿·Ö,Ëü¿ÉÒÔʹÓÃ×îСµÄCÅÌ´æ´¢
¿ªÏúÀ´Õì²âÊý¾ÝÐеľ»±ä¸ü.ÄÇôËüÒ²¾Í²»ÄÜÏñCDCÄÇÑù¿ÉÒÔÌṩÓû§±íµÄ
ÀúÊ·¸ü¸ÄÐÅÏ¢. ¸ü¸ÄÊÇʹÓÃÒ ......
1. Ñ¡ÓÃÊʺϵÄORACLEÓÅ»¯Æ÷
ORACLEµÄÓÅ»¯Æ÷¹²ÓÐ3ÖÖ:
a. RULE (»ùÓÚ¹æÔò) b. COST (»ùÓڳɱ¾) c. CHOOSE (Ñ¡ÔñÐÔ)
ÉèÖÃȱʡµÄÓÅ»¯Æ÷,¿ÉÒÔͨ¹ý¶Ôinit.oraÎļþÖÐOPTIMIZER_MODE²ÎÊýµÄ¸÷ÖÖÉùÃ÷,ÈçRULE,COST,CHOOSE,ALL_ROWS,FIRST_ROWS . Ä㵱ȻҲÔÚSQL¾ä¼ ......
¶ÔÓÚÓÐÖ÷¼ü×Ô¶¯Ôö³¤Êý¾Ý¿â±í£¬ÔÚ½øÐзÖÒ³ÉèÖÃʱ£¬ÎÒÈÏΪ»¹±È½Ï²»´íµÄÊÇ£º
SELECT TOP Ò³´óС *
from TestTable
WHERE (ID >
(SELECT MAX(id)
from (SELECT TOP Ò³´óС*Ò³Êý id
  ......
sqlͳ¼Æ£¹ØÓÚѧÉú³É¼¨(´ð°¸)
http://blog.sina.com.cn/s/blog_61380b320100ej9p.html
´ð°¸£º
1. ¼ÆËãÿ¸öÈ˵Ä×ܳɼ¨²¢ÅÅÃû
select name,sum(score) as allscore from stuscore group by name order by allscore
2. &nbs ......
¼Ó[ ]ÓÃÓÚ¶¨½çÁÐÃû»ò±íÃûµÈÐÅÏ¢£¬ÒÔÇø±ðÒ»Ð©ÌØÊâµÄ²»ºÏÃüÃû¹æÔòµÄ×Ö´®£¬»òÊÇÓëϵͳ±£Áô×ÖÓгåÍ»¡£Èç"user"ÊÇSQL Server±£ÁôµÄ¹Ø¼ü×Ö£¬ËùÒÔÓÃ"select * from user"²éѯ»áÌáʾÓï·¨´íÎó¡£¼ÓÉÏÖÐÀ¨ºÅ£¬ÒÔÉùÃ÷Æä²»ÊDZ£Áô×Ö¡£ "select * from [user]" Èç¹û±íÃû²»Êǹؼü×Ö£¬ÈçCompany£¬ÔòÓÃ"select * from Company"ÊÇûÎÊÌâµÄ£¬²»Ó ......