SQLÖÐÈçºÎÓÃÒ»¸ö±í¸üÐÂÁíÒ»¸ö±í
for ACCESS :
update a, b set a.name=b.name1 where a.id=b.id
for SQL Server:
"update a set a.name=b.name1 from a,b where a.id=b.id"
update a set a.status=b.status
from table1 a,table2 b
where a.id1=b.id1
update a inner join b on a.a1=b.b1 set a.a2=b.b2Ìõ¼þ
update table1 set a.status = b.status
from table1 a inner join table2 b
on a.idl = b.idl
http://topic.csdn.net/t/20041013/14/3451961.html
http://www.cnblogs.com/hanguoji/archive/2007/02/01/636723.aspx
Ïà¹ØÎĵµ£º
¹ØÓÚÁ½±í¹ØÁªµÄupdate£¬µ«Óï¾äÔõôд¶¼²»ÕýÈ·£¬ÀÏÊDZ¨´í£¬ÓÚÊÇÐľªÈâÌø£¨¾ÍŲ»Äܼ°Ê±Íê³É²Ù×÷£©È¥²éÁËһϣ¬NND£¬ÔÀ´°ÑSQLд³ÉÁËÔÚSQL ServerÏÂÃæµÄÌØÓÐÐÎʽ£¬ÕâÖÖÓï·¨ÔÚOracleÏÂÃæÊÇÐв»Í¨µÄ£¬¼±Ã¦¸Ä»ØÀ´£¬¼°Ê±Íê³ÉÁËÈÎÎñ¡£Ë³±ãÒ²°Ñ²éµ½µÄSQLÌû³öÀ´£¬ÄÄÌìÔÙÍü¼ÇÁË£¬Ò²ºÃÔÚÕâÀïÕÒ»ØÀ´£º
update customers a ......
---------Êýѧº¯Êý
1.¾ø¶ÔÖµ
S:select abs(-1) value
O:select abs(-1) value from dual
2.È¡Õû(´ó)
S:select ceiling(-1.001) value
O:select ceil(-1.001) value from dual
3.È¡Õû£¨Ð¡£©
S:select floor(-1.001) value
O:select floor(-1.001) value from dual
4.È¡Õû£¨½ØÈ¡£©
S:select cast(-1.002 as int) v ......
Sqlʱ¼äº¯Êý
Ò»¡¢sql serverÈÕÆÚʱ¼äº¯Êý
Sql ServerÖеÄÈÕÆÚÓëʱ¼äº¯Êý
1. µ±Ç°ÏµÍ³ÈÕÆÚ¡¢Ê±¼ä
select getdate()
2. dateadd ÔÚÏòÖ¸¶¨ÈÕÆÚ¼ÓÉÏÒ»¶Îʱ¼äµÄ»ù´¡ÉÏ£¬·µ»ØÐ嵀 datetime Öµ
......
alter table ±íÃû
add constraint Ô¼ÊøÃû
foreign key(×Ö¶ÎÃû) references Ö÷±íÃû(×Ö¶ÎÃû)
on delete cascade
Óï·¨£º
Foreign Key
(column[,...n])
references referenced_table_name[(ref_column[,...n])]
[on delete cascade]
[on update cascade]
×¢ÊÍ£º
column:ÁÐÃû
referenced_table_name:Íâ¼ü²Î¿¼µÄÖ÷¼ü± ......
Ó°ÏìÊý¾Ý¿â»¹ÔËٶȵÄÒòËØºÍÓ°ÏìÊý¾Ý¿â±¸·ÝËٶȵÄÒòËØÏàͬ¡£³ý´ËÖ®Í⣬¼ÙÈçÄãʹÓÃSQL Server 2005µÄ»°£¬Ä㻹¿ÉÒÔÆô¶¯ÁíÍâÒ»¸öÓÅ»¯ÈÎÎñÀ´»¹Ôµ±Ç°²»´æÔÚµÄÊý¾Ý¿â£¬ÔËÐл·¾³ÎªWindows XP£¬Windows 2003 Server »ò¸üа汾¡£
Perform Volume Maintenance Tasks
µ±Ä㻹ÔÒ»¸öеÄÍêÕûÊý¾Ý¿âÊÇ£¬SQL Server¶Á±¸·ÝÎļþÍ·£¬È»ºó´ ......