关于ORACLE的UPDATE更新多表的问题

网络整理 - 07-27

  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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