Question

我有一个查询

$cartable = DB::table('requests')
        ->select('requests.*','crequest.*')
        ->leftJoin('crequest','crequest.id','=','requests.request_id')
        ->whereRaw("FIND_IN_SET('$userid', crequest.user_allows)")
        ->orderBy('forms_cartable.id','desc')->get();

我的桌子：

requests:
+------+-------------+-------------------+-------------------+
| id   | request_name | request_priority | request_status    |
+------+-------------+-------------------+-------------------+
|  1   |    test1    |         low       |      process      |
|  2   |    test2    |         low       |      process      |
|  3   |    test3    |         low       |      process      |
+------+--------------+------------------+-------------------+


crequest
+------+-------------+----------------+--------------+
| id   | request_id  | users_allow    | c_status     |
+------+-------------+----------------+--------------+
|  3   |    1        |  12,13,15      | done         |
|  4   |    1        |  12            | done         |
|  5   |    1        |  13            | end          |
|  6   |    2        |  42,12,35      | done         |
|  7   |    2        |  47,65         | done         |
|  8   |    3        |  42            | open         |
+------+-------------+----------------+--------------+

我想要是否存在当前用户ID（已记录）在crequest.user_allows返回请求中，只有没有crequest detail

看起来像这样：

（如果当前用户ID为12）请求表结果（执行查询后）

+------+-------------+-------------------+-------------------+
| id   | request_name | request_priority | request_status    |
+------+-------------+-------------------+-------------------+
|  1   |    test1     |         low      |      process      |
|  2   |    test2     |         low      |      process      |
+------+--------------+------------------+-------------------+

但查询结果表crequest中的所有记录匹配我只需要请求行，如果在crequest表中匹配

Answer 1

我不知道php但您可以通过很多方式在MySql中实现它。这些是他们中的3种方式..

方法1：

SELECT DISINCT R.*
FROM requests R
INNER JOIN crequest CR ON R.id = CR.request_id
WHERE FIND_IN_SET ('12', CR.users_allow);

方法2：

SELECT *
FROM requests R
WHERE EXISTS (SELECT 1 FROM crequest CR WHERE R.id = CR.request_id 
AND FIND_IN_SET ('12', CR.users_allow));

方法3：

SELECT *
FROM requests R
WHERE R.id in (SELECT request_id FROM crequest WHERE FIND_IN_SET ('12', CR.users_allow))

SQL查询 - 获取行在其他表格laravel上的某些值

1 个答案: