Question

我有下面的查询工作正常，但我想通过添加另一个条件来修改它，但我不知道如何去做。我要添加的内容显示在第二个查询中，但它不起作用。

   $results_pref_school1 = $db->query('SELECT mps.mps_client_ec_no,mcs.mcs_client_ec_no
                                          FROM match_pref_schools AS mps
                                          INNER JOIN match_current_schools AS mcs
                                          ON mps.mps_school_id = mcs.mcs_school_id
                                          WHERE mcs.mcs_id IN (SELECT MIN(mcs.mcs_id) 
                                                              FROM match_current_schools AS mcs
                                                              GROUP BY mcs.mcs_school_id)
                                          ORDER BY mcs.mcs_id');

我只需要具有'A'状态的结果

  $results_pref_school1 = $db->query('SELECT mps.mps_client_ec_no,mcs.mcs_client_ec_no
                                      FROM match_pref_schools AS mps
                                      INNER JOIN match_current_schools AS mcs
                                      ON mps.mps_school_id = mcs.mcs_school_id
                                      WHERE mcs.mcs_id IN (SELECT MIN(mcs.mcs_id) 
                                                          FROM match_current_schools AS mcs
                                                          GROUP BY mcs.mcs_school_id)
                                      AND mps.mps_status = "A" 
                                      AND mcs.mcs_status = "A"
                                      ORDER BY mcs.mcs_id');

Answer 1

我不是100％肯定我正在回答你想要问的问题，但你可以通过使用括号在on条款中有多个条件

select
    *
from
    table_1
    inner join table_2 on(
        table_2.column_1 = table_1.column
        and (
            table_2.other_column = 'value'
            or table_2.other_column = 'other value'
        )
    )

Answer 2

您可以尝试：

SELECT mps.mps_client_ec_no,mcs.mcs_client_ec_no
FROM match_pref_schools AS mps
INNER JOIN match_current_schools AS mcs
    ON mps.mps_school_id = mcs.mcs_school_id
    AND mps.mps_status = "A" 
    AND mcs.mcs_status = "A"
WHERE mcs.mcs_id IN (
    SELECT MIN(mcs.mcs_id) 
    FROM match_current_schools AS mcs
    GROUP BY mcs.mcs_school_id)
    ORDER BY mcs.mcs_id
)

SQL INNER JOIN具有多个条件

2 个答案: