mysql - if 子句返回多行

Question

我需要使用 if 子句从表中获取数据，这是我正在尝试执行的操作的示例；

select if (condition='example',
(/*query1(return more than one row)*/),
(/*query2(return more than one row)*/) as data from table1 where iduser='1'

我的完整查询:

SELECT 
if(bagian='DOKTER',
(SELECT b.ruper
from bsl_ruang b 
join mr_ranap_dokter d 
on (b.noregis=d.noregis) 
where d.dokter = '999999'),
(SELECT u.nama 
FROM m_unit u 
join muser_tdinas t 
on(t.unit=u.unit) 
where id_user = '999999')) as ruper 
FROM `muser` where id_user = '999999'

我的 table ；

bsl_ruang                    mr_ranap_dokter       
++========++======++         ++========++========++
||noregis ||ruper ||         ||dokter  ||noregis ||
++========++======++         ++========++========++
||10000000||ruper1||         ||9999999 ||10000000||
||10000001||ruper2||         ||9999999 ||10000001||
++========++======++         ++========++========++

m_unit                       muser_tdinas                  m_user
++========++======++         ++========++========++        ++========++=======++
||unit    ||nama  ||         ||id_user ||unit    ||        ||id_user ||bagian ||
++========++======++         ++========++========++        ++========++=======++
||00001   ||ruper1||         ||8888888 ||00001   ||        ||9999999 ||DOKTER ||
||00002   ||ruper2||         ||8888888 ||00002   ||        ||8888888 ||PERAWAT||
++========++======++         ++========++========++        ++========++=======++

摘要

所以if bagian=dokter，它将连接表bsl_ruang和mr_ranap_dokter并得到ruper

并且if bagian=perawat，它将连接表m_unit和muser_tdinas并得到nama

但是if子句只能返回一个数据，还有其他方法吗？请注意，我无法更改我的数据库

Answer 1

也许这不是最好的解决方案，但我决定使用一个程序来解决我的问题，这是我的程序；

CREATE DEFINER=`root`@`%` PROCEDURE `GetRuperRanap`(lIdUser Varchar(12))
BEGIN
     Declare lBagian VarChar(20);
     SELECT bagian into lBagian FROM `muser` where id_user = lIdUser;
     if lBagian='DOKTER' then
         SELECT distinct b.ruper as ruper from bsl_ruang b join mr_ranap_dokter d on (b.noregis=d.noregis) where d.dokter = lIdUser;
     else
         SELECT u.nama as ruper FROM m_unit u join muser_tdinas t on(t.unit=u.unit) where id_user = lIdUser;
     end if;
END;

我只需要在查询时调用它，希望它有帮助