Question

我正在为WordPress编写一个SQL查询，用于搜索用户搜索之间的实时事件。我现在正在对其进行硬编码以进行测试。

目前，每次post_id出现在wp_postmeta表中时，都会返回两个事件，任何人都可以看到这个逻辑可能存在问题吗？

SELECT ID, post_title 
    FROM $wpdb->posts AS post 
    INNER JOIN $wpdb->postmeta AS meta
    ON (post.ID = meta.post_id)
    INNER JOIN $wpdb->postmeta AS meta2
    ON (post.ID = meta2.post_id)
    WHERE post.post_status = 'publish'
    AND post.post_type = 'event' 
    AND post.post_author = '1' 
    AND (
           ( (meta.meta_key = 'date_0_start-date' AND meta.meta_value < '20140620') AND (meta2.meta_key = 'date_0_end-date' AND meta2.meta_value > '20140630') )
        OR ( (meta.meta_key = 'date_0_start-date' AND meta.meta_value < '20140620') AND (meta2.meta_key = 'date_0_end-date' AND meta2.meta_value >= '20140620') )
        OR ( (meta.meta_key = 'date_0_start-date' AND meta.meta_value > '20140620') AND (meta.meta_key = 'date_0_start-date' AND meta.meta_value <= '20140630') )
        OR ( (meta.meta_key = 'date_0_start-date' AND meta.meta_value >= '20140620') AND (meta2.meta_key = 'date_0_end-date' AND meta2.meta_value <= '20140630') )
    )

Answer 1

您必须使用DISTINCT之类的

SELECT DISTINCT ID, post_title

而不是

SELECT ID, post_title

Answer 2

如果我正确理解了这个问题，我认为你需要将where子句中最后一个括号内的部分看作是这样的

meta.meta_key = 'date_0_start-date' AND meta.meta_value <= '20140630' and
meta2.meta_key = 'date_0_end-date' AND meta2.meta_value >= '20140620'

这应匹配任何与日期范围'20140620'重叠至'20140630'的事件

SQL返回重复的结果

2 个答案: