Oracle DML語句

1、Merge into

MERGE [INTO [schema .] table [t_alias] 
USING [schema .] { table | view | subquery } [t_alias] 
ON ( condition ) 
WHEN MATCHED THEN merge_update_clause 
WHEN NOT MATCHED THEN merge_insert_clause

merge into 表 
using {表，子查詢結果集}
on (條件)
when matched then(匹配)
  update set users.user_name = doctor.doctorname
when not matched then(不匹配)
  insert  values('值1','值2',....)

merge into users
     using man
on (users.user_id = man.man_id)
when matched then
     update set users.user_name = man.man_name
when not matched then
     insert values  (man.man_id,man.man_name,'年齡',sysdate);