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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


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S:select abs(-1) value
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S:select floor(-1.001) value
O:select floor(-1.001) value from dual
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S:select cast(-1.002 as int) v ......

SQLÓï¾ä ÁªºÏ²éѯ»¹ÊÇÔÚ²éѯ½á¹ûÖÐǶÌ×

TABLE MASTER   ×Ö¶Î ID DETAIL.....
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1,SELECT A.SYS_ID,A.CODE_ID,B.DETAIL,C.DETAIL...... from BIZ A,MASTER B,MASTER C WHERE A.SYS_ID=B.ID AND A.CODE_ID=C.ID
2,SELECT SYS_ID,(SELECT DETAIL from MASTER ......

SQL¼¶Áª¸üкͼ¶ÁªÉ¾³ý

alter table ±íÃû
add constraint Ô¼ÊøÃû
foreign key(×Ö¶ÎÃû) references Ö÷±íÃû(×Ö¶ÎÃû)
on delete cascade
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Foreign Key
(column[,...n])
references referenced_table_name[(ref_column[,...n])]
[on delete cascade]
[on update cascade]
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referenced_table_name:Íâ¼ü²Î¿¼µÄÖ÷¼ü± ......

sqlÓï¾ä²éѯ±íµÄ×Ö¶ÎÃû

select name from syscolumns where id in (select id from sysobjects where type = 'u' and name = 'ÏàÓ¦±íÃû')  
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if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[tb_cost]') and OBJECTPROPER ......

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