Oracle Update多表关联更新

项目中用到了Oracle Update多表关联更新，简单记录一下

写法一：

update TBL_COMPANY_USER card
   set card.status = 9
 where card.company_id = 
       (select company.ID
          from TBL_COMPANY_INFO company
         where company.CODE = '10001')
   and card.cp_id = 
       (select cp.ID from TBL_CP_INFO cp where cp.CODE = '01')
   and card.card_face_no = '10756415700'

写法二：

update TBL_COMPANY_USER card
   set card.status = 2   
   where exists (select *
                 from TBL_COMPANY_INFO tcoi, TBL_CP_INFO tcpi
                where card.company_id = tcoi.id 
   and card.cp_id = tcpi.id
   and tcoi.code = '10001'
   and tcpi.code = '01'
   and card.card_face_no = '10756415700') 

写法三：

UPDATE table_1 a
   SET col_x1 = (SELECT b.col_y1, b.col_y2 FROM table_2 b WHERE b.col_n = a.col_m),
       col_x2 = (SELECT b.col_y2 FROM table_2 b WHERE b.col_n = a.col_m)
WHERE EXISTS (SELECT * FROM table_2 b WHERE b.col_n = a.col_m)

或

UPDATE table_1 a
   SET col_x1 = (SELECT b.col_y1, b.col_y2 FROM table_2 b WHERE b.col_n = a.col_m),
       col_x2 = (SELECT b.col_y2 FROM table_2 b WHERE b.col_n = a.col_m)
WHERE a.col_m=(SELECT b.col_n FROM table_2 b WHERE b.col_n = a.col_m)

写法四：

UPDATE table_1 a
   SET (col_x1, col_x2) = (SELECT b.col_y1, b.col_y2 FROM table_2 b WHERE b.col_n = a.col_m)
WHERE EXISTS (SELECT * FROM table_2 b WHERE b.col_n = a.col_m);

或

UPDATE table_1 a
   SET (col_x1, col_x2) = (SELECT b.col_y1, b.col_y2 FROM table_2 b WHERE b.col_n = a.col_m)
WHERE a.col_m=(SELECT b.col_n FROM table_2 b WHERE b.col_n = a.col_m)