简单数据库上的 MySQL Join 语句

Question

我有一个数据库，其中包含移动运营商的流行设备和品牌。

我想进行一个联接查询来选择帐户 + 品牌最流行的型号；

   SELECT m1.name FROM
    models as m1 
     JOIN accounts_to_models as am1
      ON m1.id = am1.FK_model_id

    JOIN brands as br 
    on br.id = m1.FK_brand_id

     JOIN accounts as ac
    on ac.id = am1.FK_account_id

    WHERE ac.name = "Operator" and b1.name = "HTC"
    ORDER BY am1.priority desc limit 10

Answer 1

我猜测 brands 上的联接是错误的，accounts 上的联接也是错误的。试试这个:

SELECT m1.name
FROM models m1 JOIN
     accounts_to_models am1
     ON m1.id = am1.FK_model_id JOIN
     brands as b1 
     ON b1.id = m1.FK_brand_id JOIN
--------------------^
     accounts as ac
     on ac.id = am1.FK_account_id
-----------^
WHERE ac.name = 'Operator' and b1.name = 'HTC'
ORDER BY am1.priority desc
limit 10;