ORACLE中将一个值赋值到另一个表的值

转自： http://www.cnblogs.com/mybi/archive/2012/06/04/2535274.html  

update tmp_customer_list t
set email = (select email from tmp_etl_customerlist e where t.mobile = e.mobile);

更加高效的方法：（将表CUSTOMER_LIST_TMP01中的值customerlevel赋值到customer_list中，满足的先决条件是 t.customerkey = t1.customerkey）

merge into  customer_list t

using CUSTOMER_LIST_TMP01 t1

on(t.customerkey = t1.customerkey)

when matched then update set t.customerlevel = t1.customerlevel ;

commit;