ORDER BY打破了复杂的QUERY

Question

我有一个复杂的查询，当我尝试添加"ORDER BY b.allowed"时会中断 - 我在哪里可以添加它，为什么它会破坏查询？

$listpage = mysql_query(
"SELECT 
    LEFT(a.post_content, 80) AS excerpt, a.id, 
    a.post_title, a.guid,
    MAX(CASE WHEN b.meta_key = 'allowed' THEN b.meta_value END) allowed,
    MAX(CASE WHEN b.meta_key = 'amenities' THEN b.meta_value END) amenities,
    MAX(CASE WHEN b.meta_key = 'trail-type' THEN b.meta_value END) trailtype,
    MAX(CASE WHEN b.meta_key = 'miles' THEN b.meta_value END) miles,
    MAX(CASE WHEN b.meta_key = '_pronamic_google_maps_latitude' 
        THEN b.meta_value END) weatherlat,
    MAX(CASE WHEN b.meta_key = '_pronamic_google_maps_longitude' 
        THEN b.meta_value END) weatherlon
 FROM 
    wp_posts a
    LEFT JOIN wp_postmeta b ON a.id = b.post_id
 WHERE 
    a.id IN (SELECT object_id AS id FROM wp_term_relationships 
       WHERE term_taxonomy_id = ". $mycatid .") 
 group by b.post_id");

Answer 1

您可以尝试在 group by 子句后添加：

ORDER BY 5 

“5”表示在这种情况下，第五个字段（允许）。

我希望它可以帮到你。