原文:

关于两表关联的update，可以把SQL写成了在SQL Server下面的特有形式，但是这种语法在Oracle下面是行不通的

   update customers a

   set    city_name=(select b.city_name from tmp_cust_city b where b.customer_id=a.customer_id)

   where  exists (select 1

                  from   tmp_cust_city b

                  where  b.customer_id=a.customer_id

                 )

   -- update 超过2个值

   update customers a 

   set    (city_name,customer_type)=(select b.city_name,b.customer_type

                                     from   tmp_cust_city b

                                     where  b.customer_id=a.customer_id)

   where  exists (select 1

                  from   tmp_cust_city b

                  where  b.customer_id=a.customer_id

                 )

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