MySQL查询returns个结果无序

Question

我试图在 'orderindex' 中组织查询输出，以便在我的 php 函数循环中正确显示列表 mysql。

目前我的 SQL 查询是这样的：

SELECT * FROM (SELECT NewCustInfo.Driver, SUBSTRING_INDEX(NewCustInfo.Driver, '/', -1) AS orderindex, SUBSTRING_INDEX(NewCustInfo.Driver, '/', 1) AS thedriver, NewCustInfo.id,NewCustInfo.Accomplished
 FROM NewCustInfo WHERE NewCustInfo.Driver REGEXP 'Test123/' AND NewCustInfo.Accomplished='0' ORDER BY orderindex DESC) DUMMY_ALIAS1
UNION ALL
SELECT * FROM (SELECT PickupSlip.Driver, SUBSTRING_INDEX(PickupSlip.Driver, '/', -1) AS orderindex, SUBSTRING_INDEX(PickupSlip.Driver, '/', 1) AS thedriver, PickupSlip.id,PickupSlip.Accomplished
 FROM PickupSlip WHERE PickupSlip.Driver REGEXP 'Test123/' AND PickupSlip.Accomplished='0' ORDER BY orderindex DESC) DUMMY_ALIAS2
UNION ALL
SELECT * FROM (SELECT DeliverySlip.Driver, SUBSTRING_INDEX(DeliverySlip.Driver, '/', -1) AS orderindex, SUBSTRING_INDEX(DeliverySlip.Driver, '/', 1) AS thedriver, DeliverySlip.id,DeliverySlip.Accomplished
 FROM DeliverySlip WHERE DeliverySlip.Driver REGEXP 'Test123/' AND DeliverySlip.Accomplished='0' ORDER BY orderindex DESC) DUMMY_ALIAS3

我意识到这是按 SELECT 排序，而不是整个查询。有没有办法订购所有 3 SELECTS 的完整结果？

例如将 3 个选择变成一个变量，然后以某种方式将它们连接成一个列表，然后用 ORDER BY?

显示

Answer 1

根据 mysql 在 UNION 上的语法，在最后一个 select:

后放置一个 order by 子句

(SELECT a FROM t1 WHERE a=10 AND B=1)
UNION
(SELECT a FROM t2 WHERE a=11 AND B=2)
ORDER BY a

MySQL查询returns个结果无序

MySQL query returns results without order

php

mysql

union

select