我正在使用此 sql 返回基于具有 3 个元值的内部联接的结果。它似乎只适用于 1 AND ( ),当我添加另外两个时它返回 0 个结果。
SELECT * FROM wp_posts
INNER JOIN wp_postmeta
ON ( wp_posts.ID = wp_postmeta.post_id )
WHERE wp_posts.post_type = 'plot'
AND wp_posts.post_status = 'publish'
AND ( wp_postmeta.meta_key = 'plot_type' AND wp_postmeta.meta_value = 'Cottage' )
AND ( wp_postmeta.meta_key = 'number_of_bedrooms' AND wp_postmeta.meta_value = '2' )
AND ( wp_postmeta.meta_key = 'property' AND wp_postmeta.meta_value = '446' )
GROUP BY wp_posts.ID
ORDER BY wp_posts.post_title ASC;
最佳答案
我认为您打算将 OR 与其他 2 个一起使用(见下文)。同一个字段不能有 2 个不同的东西,这就是为什么你会得到 0 个结果。
SELECT *
FROM wp_posts
INNER JOIN wp_postmeta
ON (wp_posts.ID = wp_postmeta.post_id)
WHERE wp_posts.post_type = 'plot'
AND wp_posts.post_status = 'publish'
AND ((wp_postmeta.meta_key = 'plot_type' AND
wp_postmeta.meta_value = 'Cottage') OR
(wp_postmeta.meta_key = 'number_of_bedrooms' AND
wp_postmeta.meta_value = '2') OR (wp_postmeta.meta_key = 'property' AND
wp_postmeta.meta_value = '446'))
GROUP BY wp_posts.ID
ORDER BY wp_posts.post_title ASC;
编辑,试试下面的方法:
select * from wp_posts
join wp_postmeta on wp_posts.ID = wp_postmeta.post_id
where wp_posts.post_type = 'plot'
and wp_posts.post_status = 'publish'
and concat(wp_postmeta.meta_key,'|',wp_postmeta.meta_value)
in ('plot_type|Cottage',
'number_of_bedrooms|2',
'property|446');
关于mysql - 无法在内部联接上查询多个值,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21759623/