mysql多条件排序

Question

我在下面有sql，它想要做多个订单。

SELECT
    r.*,
    s.uzunluq,
    b.id,
    au.status_id as aksessuar_status,
    au.aksessuar_id,
    au.aksessuar
FROM
    seksiya s,
    result r
LEFT JOIN bosh_seksiya_aksessuar b
    ON
    b.bosh_seksiya = r.model AND
    b.ERK = :ses
LEFT JOIN aksessuar_up au
    ON au.model_id = r.res_id AND
    au.user_id = :user_id AND
    au.status_id = 9
WHERE 
    r.user_id = :user_id AND
    r.model=s.seksiya AND 
    s.erk = :ses AND
    r.status_id IN (1,2,3,4,5)
ORDER BY 
    r.res_id

我认为编写PDO对你们来说并不重要，因为我的问题只是关于这个sql的。这个sql运行得很好，我只想添加额外的函数。因此，请参阅本专栏：r.status_id IN (1,2,3,4,5)

我给了Order BY r.res_id

我的问题是:我想对每个status_id使用多个顺序

如何订购：

ORDER BY r.res_id DESC WHERE r.status_id IN (1,2)

和

ORDER BY r.res_id WHERE r.status_id IN (3,4,5)

在这个sql中？

Answer 1

ORDER BY IF(r.status_id IN (1,2), r.res_id, NULL) DESC, r.res_id

使用此ORDER BY子句排序的记录集将首先显示使用r.status_id IN (1,2)进行排序的所有记录(因为NULL值按降序排列)，它们本身按r.res_id的降序排序；其次是由r.res_id按升序排序的所有其他值。

Answer 2

您可以使用联合语法：

SELECT * FROM ((SELECT
    r.*,
    s.uzunluq,
    b.id,
    au.status_id as aksessuar_status,
    au.aksessuar_id,
    au.aksessuar,
    1 as query_order
FROM
    seksiya s,
    result r
LEFT JOIN bosh_seksiya_aksessuar b
    ON
    b.bosh_seksiya = r.model AND
    b.ERK = :ses
LEFT JOIN aksessuar_up au
    ON au.model_id = r.res_id AND
    au.user_id = :user_id AND
    au.status_id = 9
WHERE 
    r.user_id = :user_id AND
    r.model=s.seksiya AND 
    s.erk = :ses AND
    r.status_id IN (1,2)
ORDER BY 
    r.res_id DESC) as table1
UNION
(SELECT
    r.*,
    s.uzunluq,
    b.id,
    au.status_id as aksessuar_status,
    au.aksessuar_id,
    au.aksessuar,
    0 as query_order
FROM
    seksiya s,
    result r
LEFT JOIN bosh_seksiya_aksessuar b
    ON
    b.bosh_seksiya = r.model AND
    b.ERK = :ses
LEFT JOIN aksessuar_up au
    ON au.model_id = r.res_id AND
    au.user_id = :user_id AND
    au.status_id = 9
WHERE 
    r.user_id = :user_id AND
    r.model=s.seksiya AND 
    s.erk = :ses AND
    r.status_id IN (3,4,5)
ORDER BY 
    r.res_id) as table2) sa table3 ORDER BY query_order