关于ORACLE的UPDATE更新多表的问题

有以下几种方式可以实现:

一种是：

update table1

set (field1,field2...) =

(Select Field1,field2....

from table2

where table1.field1=table2.field1)

where table1.field1 in (select field1 from table2)

二种是：

将table1,table2相关联字段建立主键Primary key 或Union key

Update (Select Table1.field1,table1.field2,table2.field1,table2.field2

from table1,table2

where Table1.Field1=table2.field1)

Set table1.table2=table2.table2,

table1.fieldn=table2.tablen,

......

table1的Field1和table2的field1将需要建立主键或唯一索引才行

三种是：

merge into table1

using table2

on (table1.field1=table2.field1 and ....)

when matched then Update set table1.field2=table2.field2,

table1.fieldn=table2.fieldn,

......

when not matched then [doing other thing]

其余方法可使用游标

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/cgboy88/archive/2009/12/30/5105594.aspx

关于ORACLE的UPDATE更新多表的问题有以下几种方式可以实现: 一种是： update table1 set (field1,field2...) = (Select Field1,field2.... from table2 where table1.field1=table2.field1) where table1.field1 in (select field1 from table2) 二种是： 将table1,table2相关联字段建立主键Primary key 或Union key Update (Select Table1.field1,table1.field2,table2.field1,table2.field2 from table1,table2 where Table1.Field1=table2.field1) Set table1.table2=table2.table2, table1.fieldn=table2.tablen, ...... table1的Field1和table2的field1将需要建立主键或唯一索引才行 三种是： merge into table1 using table2 on (table1.field1=table2.field1 and ....) when matched then Update set table1.field2=table2.field2, table1.fieldn=table2.fieldn, ...... when not matched then [doing other thing] 其余方法可使用游标 本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/cgboy88/archive/2009/12/30/5105594.aspx