ORACLE的UPDATE更新多表

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

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