Question

我有这个SQL语句，但我不知道如何在Oracle中编写它（Oracle不支持多表更新）：

UPDATE sscanner.sis_emp_card ec, sscanner.sis_cards c, sscanner.sis_employees e 
SET e.firstname='x', e.lastname='y', e.car_number=NULL, c.card_number='12345', e.email='x.y@xyz.com', ec.active='1' 
WHERE ec.id_card = c.id_card AND ec.id_emp=e.id_employee AND id=1;

sis_cards：id_card（PK）..

sis_employees：id_employee（PK）..

sis_emp_card：id（PK），id_card（FK）引用sis_cards，id_employee（FK）引用sis_employees

Answer 1

尝试逐个更新，如下面的代码

begin
   for R in (select e.rowid ERecId, c.rowid CRecId, ec.rowid ECRecId
               from sscanner.sis_emp_card ec, sscanner.sis_cards c,
                    sscanner.sis_employees e
              where ec.id_card = c.id_card
                and ec.id_emp = e.id_employee
                and id = 1) loop

      update sscanner.sis_employees
         set firstname = 'x',
             lastname = 'y',
             car_number = null,
             email = 'x.y@xyz.com'
       where rowid = R.ERecid;

      update sscanner.sis_cards
         set card_number = '12345'
       where rowid = R.CRecId;

      update sscanner.sis_emp_card ec
         set ec.active = '1'
       where rowid = R.ECRecId;

   end loop;
end;

Answer 2

我知道问题已经得到解答，但有一些Oracle语法用于更新。最后一个是更新连接视图。

UPDATE sscanner.sis_employees e
       SET e.firstname='x', 
           e.lastname='y', 
           e.car_number=NULL,
           e.email = 'x.y@xyz.com'
    WHERE EXISTS (
       SELECT *
       FROM sscanner.sis_emp_card ec, sscanner.sis_cards c
       WHERE ec.id_card = c.id_card AND ec.id_employee=e.id_employee AND ec.id=1);

    UPDATE sscanner.sis_cards c
        SET c.card_number = '12345'
    WHERE EXISTS(
        SELECT *
        FROM sscanner.sis_emp_card ec,  sscanner.sis_employees e
        WHERE c.id_card = ec.id_card AND ec.id_employee=e.id_employee AND ec.id=1);

    UPDATE (
        SELECT e.firstname, e.lastname, e.car_number, e.email,
        c.card_number, ec.active
        FROM sscanner.sis_emp_card ec, sscanner.sis_cards c,  sscanner.sis_employees e
        WHERE ec.id_card = c.id_card AND ec.id_employee=e.id_employee AND ec.id=1
        ) ec SET 
        ec.active='1';

如何将此查询从MySQL（SQL）写入Oracle（SQL）

2 个答案: