如何将SQL数据与OR条件混合

Question

我有一个SQL查询在1月1日至12月31日之间返回2 post_type：

$url = current date (2017 for example)

SELECT * 
FROM `posts` 
WHERE `post_date` 
BETWEEN '".$url."-01-01' 
AND '".$url."-12-31' 
AND post_status = 'publish' 
AND post_type = 'car' 
OR `post_date` 
BETWEEN '".$url."-01-01' 
AND '".$url."-12-31' 
AND post_status = 'publish' 
AND post_type = 'motorbike' 
ORDER BY 'post-date'"

我的查询有效，但结果首先是reutnr car ，其次是motorbike 。

我想post_date而不是按post_type混合数据。

任何想法 ？

编辑：

当前结果：

Car | January
Car | February
Car | April
[...]
Car | July
Car | August
Motorbike | January
Motorbike | March
Motorbike | May
Motorbike | June
[...]  

我想要的是 ：

Car | January
Motorbike | January
Car | February
Motorbike | March
Car | April
Motorbike | May
Motorbike | June
Motorbike | July
Car | August
[...]

带有“ month”但格式日期为2017-12-31的示例

Answer 1

演示： http : //rextester.com/MBRS91171

使用IN vs或or简化查询

SELECT * 
FROM posts 
WHERE `post_date` 
BETWEEN '2017-01-01' 
  AND '2017-12-31' 
  AND post_status = 'publish' 
  AND post_type in ('car', 'motorbike')
ORDER BY post_date desc;  

或者只是确保order by语法正确。

SELECT * 
FROM `posts` 
WHERE `post_date` 
BETWEEN '".$url."-01-01' 
AND '".$url."-12-31' 
AND post_status = 'publish' 
AND post_type = 'car' 
OR `post_date` 
BETWEEN '".$url."-01-01' 
AND '".$url."-12-31' 
AND post_status = 'publish' 
AND post_type = 'motorbike' 
ORDER BY `post_date`

确保post_date与post_date和'post-date'顺序正确

Answer 2

目前尚不清楚您要做什么。 但是，如果要先按car的邮政类型进行订购，则可以按如下方式按顺序使用CASE表达式：

...
ORDER BY CASE WHEN post_type = 'car' THEN 0 ELSE 1 END, 'post-date'

Answer 3

这个怎么样

ORDER BY post_date asc,post_type asc