Question

即使数据库中有发布日期和到期日期，以下查询也不会返回任何结果

SELECT wposts.* 
FROM qit_posts wposts INNER JOIN qit_postmeta wpostmeta ON wposts.ID = wpostmeta.post_id
WHERE wposts.post_type IN ('ad_listing') AND 
wpostmeta.meta_key ='cp_publish_date' 
      AND wpostmeta.meta_value <= '2013-12-10' 
      AND wpostmeta.meta_key ='cp_expiry_date' 
      AND wpostmeta.meta_value >= '2013-12-10'

在数据库表中有一个帖子，其中有一个元字段cp_publish_date，其值为2013-12-08和cp_expiry_date 2013-12-31 查询应返回特定原始，但它不会返回它，有没有人知道这个，什么，可能是问题，这里比较日期格式没有问题，我正在处理它

Answer 1

正如我所见，你在wpostmeta.meta_key中查找，但已经使用“AND”参数ur ar使用它有两个不同的值。

wpostmeta.meta_key ='cp_publish_date'  AND AND wpostmeta.meta_key ='cp_expiry_date'

你应该使用“或”参数。

我想你想这样做;

SELECT wposts.* 
FROM qit_posts wposts INNER JOIN qit_postmeta wpostmeta ON wposts.ID = wpostmeta.post_id
WHERE wposts.post_type IN ('ad_listing') AND (
wpostmeta.meta_key ='cp_publish_date' 
      AND wpostmeta.meta_value <= '2013-12-10' ) OR
       (wpostmeta.meta_key ='cp_expiry_date' 
      AND wpostmeta.meta_value >= '2013-12-10' )

放轻松

Answer 2

尝试使用STR_TO_DATE(str,format) wp的meta_value类型文本，您需要根据所需的日期格式将其转换为日期，还需要加入qit_postmeta两次才能两个不同的键

SELECT wposts.* 
FROM qit_posts wposts 
INNER JOIN qit_postmeta wpostmeta ON wposts.ID = wpostmeta.post_id
INNER JOIN qit_postmeta wpostmeta2 ON wposts.ID = wpostmeta.post_id
WHERE wposts.post_type IN ('ad_listing') 
AND  wpostmeta.meta_key ='cp_publish_date' 
AND STR_TO_DATE(wpostmeta.meta_value,'%d %M,%Y') <= '2013-12-10' 
AND wpostmeta2.meta_key ='cp_expiry_date' 
AND STR_TO_DATE(wpostmeta2.meta_value,'%d %Y,%Y') >= '2013-12-10'
GROUP BY wposts.ID

STR_TO_DATE(str,format)

Answer 3

使用OR无济于事。试试这个：

SELECT wposts.* 
FROM qit_posts wposts 
JOIN (
  SELECT post_id
  FROM qit_postmeta
  GROUP BY post_id
  HAVING SUM(
    CASE 
     WHEN meta_key ='cp_publish_date' AND meta_value <= '2013-12-10' THEN 1
     WHEN meta_key ='cp_expiry_date' AND meta_value >= '2013-12-10' THEN 1
     ELSE 0
    END 
    ) = 2
  ) wpostmeta
ON wposts.ID = wpostmeta.post_id
WHERE wposts.post_type IN ('ad_listing')

Wordpress自定义查询不返回结果

3 个答案: