帮助SQL查询

Question

我有一个工作生成的SQL查询，但是我无法理解我如何计算它！ GROUP BY函数阻止正常COUNT(*)工作..希望有人可以提供帮助。

SELECT wposts.* FROM wp_posts wposts, wp_postmeta wpostmeta 
WHERE wposts.ID = wpostmeta.post_id
AND wpostmeta.meta_key = 'phone' 
AND wpostmeta.meta_value = '1542' 
AND wposts.post_status = 'publish' 
AND wposts.post_type = 'tips' || wposts.ID = wpostmeta.post_id 
AND wpostmeta.meta_key = 'phone' 
AND wpostmeta.meta_value = '1541' 
AND wposts.post_status = 'publish' 
AND wposts.post_type = 'tips' || ........ 
GROUP BY wposts.post_content 
ORDER BY wposts.post_title ASC 

由于

Answer 1

删除GROUP BY并将SELECT更改为仅COUNT(DISTINCT wposts.post_content)，以获取此查询返回的行数。

Answer 2

SELECT COUNT(DISTINCT wposts.post_content)
WHERE wposts.ID = wpostmeta.post_id
AND wpostmeta.meta_key = 'phone' 
AND wpostmeta.meta_value = '1542' 
AND wposts.post_status = 'publish' 
AND wposts.post_type = 'tips' || wposts.ID = wpostmeta.post_id 
AND wpostmeta.meta_key = 'phone' 
AND wpostmeta.meta_value = '1541' 
AND wposts.post_status = 'publish' 
AND wposts.post_type = 'tips' || ........ 
ORDER BY wposts.post_title ASC