ORACLE中将一个值赋值到另一个表的值

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：

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;