Question

我有一个查询，该查询列出了付款的列表（付款表），我想按任务的日期（与付款相关的2个单独的表-quotedb和包装）进行排序

我的查询

SELECT a.* 
FROM payments AS a 
LEFT JOIN quotedb AS b ON a.orderid = b.id  
LEFT JOIN packaging AS p ON a.orderid = p.id  
WHERE a.status='Pending' AND (b.moveday<'$today' OR p.datestamp<'$today')
ORDER BY b.moveday, p.datestamp

payments table example:

id payment   orderid
------------------- 
1  payment1  1
2  payment2  2
3  payment3  3
4  payment4  4
5  payment5  5
6  payment6  6

quotedb table example:

id moveday
-----------
1  05.07.18  > related to payments table id 1
2  08.07.18  
3  10.07.18

packaging table example:

id datestamp
-----------
4  06.07.18  > related to payments table id 4
5  07.07.18
6  19.07.18

所以我联接了表的结果，但是我在排序时遇到了问题，查询似乎将未排序的“包装”表结果打印出来，然后将“ quotedb”的结果按Moveday排序

我希望对这些结果进行排序（加入移动日和日期戳）

需要帮助，Thx伙计们。

Answer 1

您可以使用UNION ALL合并quotedb和packaging表。并使用grp进行编号以制作Order by序列号

SELECT a.* 
FROM payments a 
LEFT JOIN
(
    SELECT 1 grp,id,moveday AS day
    FROM quotedb
    UNION ALL
    SELECT 2,id,datestamp
    FROM packaging
) t on a.orderid = t.id
ORDER BY t.grp,t.day

sqlfiddle

Answer 2

SELECT a.* 
FROM payments AS a 
LEFT JOIN
(
    SELECT orderno, moveday AS sortdate FROM quotedb 
    UNION ALL
    SELECT orderno, datestamp AS sortdate FROM packaging
) t on a.orderno = t.orderno
WHERE a.status='Pending' AND sortdate<'$today'
ORDER BY sortdate

MySQL-连接表并按2个不同的列排序

2 个答案: