在MySQL中按相等值排序 [英] ORDER BY an equal value in MySQL

问题描述

全部， 到目前为止，我已经获得了以下SQL查询:

All, I've got the following SQL query as of now:

SELECT * FROM $wpdb->posts
JOIN $wpdb->term_relationships ON $wpdb->term_relationships.object_id=$wpdb->posts.ID
JOIN $wpdb->postmeta ON $wpdb->postmeta.post_id=$wpdb->posts.ID
WHERE 
$wpdb->posts.post_status = 'publish' 
AND $wpdb->posts.post_type = 'post'
AND $wpdb->term_relationships.term_taxonomy_id='$vendor_category_to_use'
AND $wpdb->postmeta.meta_key='zip'

我有一个名为featured的postmeta.meta_key.然后，如果该帖子具有特色，则该值位于另一个称为postmeta.meta_value的列中.如果meta_value = "yes"其中meta_key等于功能"，那么我想先显示一个，然后再显示其余的帖子.我该怎么做呢?

I have a postmeta.meta_key called featured. Then the value of if the post is featured is in another column called postmeta.meta_value. If the meta_value = "yes" where the meta_key equals "featured" then I want to display this one first and then display the rest of the posts after that. How can I go about doing that?

这是数据设置:

postid       meta_key      meta_value
123          featured      yes
324          featured      no
182          featured      yes
873          featured      yes

因此在此示例中，我希望我的帖子按此顺序显示:

So in this example I'd like my posts to be displayed in this order:

postid       meta_key      meta_value
123          featured      yes
182          featured      yes
873          featured      yes
324          featured      no

希望对您有帮助！

这是生成的SQL:

SELECT * 
FROM wp_posts 
JOIN wp_term_relationships ON wp_term_relationships.object_id=wp_posts.ID 
JOIN wp_postmeta ON wp_postmeta.post_id=wp_posts.ID 
WHERE wp_posts.post_status = 'publish' AND wp_posts.post_type = 'post' AND wp_term_relationships.term_taxonomy_id='5' AND wp_postmeta.meta_key='zip' AND (wp_postmeta.meta_value = '46320' OR wp_postmeta.meta_value = '46321' OR wp_postmeta.meta_value = '46322' OR wp_postmeta.meta_value = '46323' OR wp_postmeta.meta_value = '46324' OR wp_postmeta.meta_value = '46327' OR wp_postmeta.meta_value = '46394' OR wp_postmeta.meta_value = '46402' OR wp_postmeta.meta_value = '46404' ) 
ORDER BY (wp_postmeta.meta_key='featured' AND wp_postmeta.meta_value='yes') DESC, wp_posts.post_date DESC

谢谢！

推荐答案

SELECT ...
FROM   ...
ORDER BY (meta_key='featured' AND meta_value='yes') DESC, postid ASC;

如果(meta_key='featured' AND meta_value='yes')用于一行，则该行将具有1/TRUE.否则，它将为0/FALSE.因此，降序排序会将具有TRUE的行排在首位.

If (meta_key='featured' AND meta_value='yes') for a row, that row will have a 1/TRUE. Otherwise, it will have a 0/FALSE. Hence, sorting descending puts the rows that have TRUE first.

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