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
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