作者：iamlaosong

Oracle正常更新一個表中多個欄位時，欄位是分開寫的，例如：

update tb_county t
   set t.prov_name = '安徽', t.city_name = '合肥市', t.xs_mc = '廬陽區'
 where t.xs_code = '2300';

update tb_county t
   set (t.prov_name, t.city_name, t.xs_mc) = (select t.prov_name,
                                                     t.city_name,
                                                     t.xs_mc
                                                from tb_yzbm t
                                               where t.postcode = '230000')
 where t.xs_code = '2300';
 

update tb_county t
   set (t.prov_name, t.city_name, t.xs_mc) = (select '安徽',
                                                     '合肥市',
                                                     '廬陽區'
                                                from dual)
 where t.xs_code = '2300';