相关疑难解决方法(0)

我试图了解如何使用不同的值更新多行,我只是不明白.解决方案无处不在,但对我来说,它看起来很难理解.

例如,三个更新为1个查询:

UPDATE table_users
SET cod_user = '622057'
    , date = '12082014'
WHERE user_rol = 'student'
    AND cod_office = '17389551'; 

UPDATE table_users
SET cod_user = '2913659'
    , date = '12082014'
WHERE user_rol = 'assistant'
    AND cod_office = '17389551'; 

UPDATE table_users
SET cod_user = '6160230'
    , date = '12082014'
WHERE user_rol = 'admin'
    AND cod_office = '17389551'; 

我读了一个例子,但我真的不明白如何进行查询.即:

UPDATE table_to_update
SET cod_user= IF(cod_office = '17389551','622057','2913659','6160230')
    ,date = IF(cod_office = '17389551','12082014')
WHERE ?? IN (??) ;

如果在WHERE和IF条件中存在多个条件,我不完全清楚如何进行查询.任何想法？

我有以下查询:

  $query = UserSubject::where('user_id', Auth::id())->select('subject_id')->get();

正如预期的那样,我得到以下结果:

[{"user_id":8,"subject_id":9},{"user_id":8,"subject_id":2}]

有没有办法将上面的结果复制到另一个表中,以便我的表看起来像这样？

ID|user_id|subject_id
1 |8      |9
2 |8      |2

我$query遇到的问题是可以预期任意数量的行,因此我不确定如何遍历未知数量的行.