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

sql ²éѯ-¸üР×èÈû¡£¡£¡£¡££¿

Óöµ½µÄÏÖÏóÊÇ Í¬Ò»¸ö±íµÄquery»á×èÈûupdate

sql  query ºÍupdate ²Ù×÷ query»á×èÈûupdate²Ù×÷Âð

Ôõô½â¾ö

ÊDz»ÊÇʲôÉèÖò»¶Ô»¹ÊÇÔõµÄ


Èç¹û»áµÄ»°£¬ÄÇͬһ¸ö±íµÄƵ·±query and update ÄÇÊý¾Ý¿â²»×èÈûµÄ²»ÏñÑù×Ó°¡


Çó½â
ѧϰ£¬°ï¶¥£¬×îºÃÃèÊöһϾßÌåÒµÎñ

SQL code:
1 ÈçºÎËøÒ»¸ö±íµÄijһÐÐ

A Á¬½ÓÖÐÖ´ÐÐ

SET TRANSACTION ISOLATION LEVEL REPEATABLE READ

begin tran

select * from tablename with (rowlock) where id=3

waitfor delay '00:00:05'

commit tran

BÁ¬½ÓÖÐÈç¹ûÖ´ÐÐ

update tablename set colname='10' where id=3 --ÔòÒªµÈ´ý5Ãë

update tablename set colname='10' where id<>3 --¿ÉÁ¢¼´Ö´ÐÐ

2 Ëø¶¨Êý¾Ý¿âµÄÒ»¸ö±í

SELECT * from table WITH (HOLDLOCK)


×¢Òâ: Ëø¶¨Êý¾Ý¿âµÄÒ»¸ö±íµÄÇø±ð

SELECT * from table WITH (HOLDLOCK)
ÆäËûÊÂÎñ¿ÉÒÔ¶ÁÈ¡±í£¬µ«²»ÄܸüÐÂɾ³ý

SELECT * from table WITH (TABLOCKX)
ÆäËûÊÂÎñ²»ÄܶÁÈ¡±í,¸üкÍɾ³ý


SQL code:

ÅÅËûËø
http://topic.csdn.net/u/20080425/10/a1d7d337-a918-4c8c-ba97-44ae4472ade4.html?1527885039


²»Ã÷°×ʲôÒâ˼

ÒýÓÃ
²»Ã÷°×ʲôÒâ˼
.

Èç¹ûÊÇËøµÄ»°¿ÉÒԲο¼Ï£º
http://blog.csdn.net/fredrickhu/archi


Ïà¹ØÎÊ´ð£º

Ò»¸öSQLÓï¾äµÄÎÊÌâ¡£¸ßÊÖ°ï°ïæ

ÓÐÁ½¸ö±í¡£·Ö±ð¶¼ÓÐIDÖ÷¼ü¡£A±íµÄIDºÍB±íµÄIDÊǶÔÓ¦µÄ£¬¾ÍÊÇA±í¼¸¸öID£¬B±í¾Í¼¸¸öID¡£A±íµÄIDÊÇʲô,B±íµÄID¾ÍÊÇʲô¡£
¿ÉÊÇÏÖÔÚA±íµÄID±ÈB±íµÄ¶àÁË¡£
ÎÒÏÖÔÚÏëÒª°ÑB±íÖÐÉٵIJ¿·Ö¸ø²¹ÆëÁË¡£Õâ¸ö²åÈëÓ¦¸ÃÔõôд ......

linq to sqlµÄÎÊÌâ

linq to sqlÀïÔõÑùʹËüÔÚ²åÈëÊý¾Ýʱ×Ô¶¯½Ø¶Ï¹ý³¤µÄ×Ö·û´®¶ø²»ÊÇÅ׳ö´íÎó
¡£¡£¡£¡£¡£¡£¡£¡£¡£¡£ÎÒͨ³£¶¼ÊÇÌύʱ¾Í¼ì²éËûÔÚ³¤¶È¡£¡£¡£

²»ÊÇ£¬ÏÖÔÚÊÇÏîÄ¿×öÍêÁË£¬ºÜ¶àÄ£¿é²åÈëÊý¾Ýʱ¶¼³öÏÖÕâÑùµÄÎÊÌâ¡£ÒÔÇ°ÓÃsqlpa ......

sql inÎÊÌâ

listidÊÇintÊý¾Ý
declare @listid nvarchar(100)
set @listid='(1,2,3,7,9,10)'
select * from forums where listid in(@listid)ʱÌáʾÈçÏ´íÎó£º
ÔÚ½« nvarchar Öµ '(1,2,3,7,9,10)' × ......

ÇóSQL¡«¡«¡«¡«¡«

×ÜÊý±í
×ֶΠnum,freq
numÊÇËùÊôÆÚµÄ×ÜÊý£¬freqÊǼǼ¸ÃÊýÖµËùÊôÄÄÒ»ÆÚµÄ


ÇøÓò±í
×ֶΠarea_name,tot,freq
ÇøÓòÃû³Æ£¬¸ÃÇøÓòµÄ×ÜÊý£¬ËùÊôÆÚ

Á½ÕÅ±í¿¿freq¹ØÁª£¬ÇÒ²»ÊÇ×ÔÔö×ֶΣ¬²»ÊÇÖ ......

sql server 2000 µÇ¼ʧ°Ü

µã»÷¡°·þÎñ¹ÜÀíÆ÷¡±£¬µã»÷¡°¿ªÊ¼/¼ÌÐø¡±£¬×ÜÊÇÏÔʾ¡°ÓÉÓڵǼʧ°Ü¶øÆô¶¯·þÎñ¡±£¬È»ºóÔٴγö´í£¬²»Äܹ»½øÈ룬Ҳ²»Äܹ»²é¿´ÊôÐÔ£¬ÇëÎÊ´ó¼Ò¸ÃÔõô°ì£¿

ÎÒÊDzſªÊ¼Ñ§Ï°Êý¾Ý¿â£¬ÇëÎÊ´ó¼ÒÓÐûÓÐʲôºÃһЩµÄ½¨Òé»òÕ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØͼ | ¸ÓICP±¸09004571ºÅ