键值对比较

Question

SELECT wposts.*, wpostmeta.*
    FROM $wpdb->posts wposts, $wpdb->postmeta wpostmeta, $wpdb->postmeta wpostmeta2, $wpdb->postmeta wpostmeta3
    WHERE wposts.ID = wpostmeta.post_id
        AND wposts.ID = wpostmeta2.post_id
        AND wposts.ID = wpostmeta3.post_id
        AND wpostmeta.meta_key = 'listing_subtype'
            AND wpostmeta.meta_value = '$search_home_type'
        AND wpostmeta2.meta_key = 'district'
            AND wpostmeta2.meta_value = '$search_district'
        AND wpostmeta3.meta_key = 'price_current'
            AND wpostmeta3.meta_value IS >= '$search_price_min' AND <= '$search_price_max'
        AND wposts.post_status = 'publish'
        AND wposts.post_type = 'vreb_property'
    ORDER BY wposts.post_date DESC

这一行AND wpostmeta3.meta_value IS >= '$search_price_min' AND <= '$search_price_max'试图确保meta_value of meta_key price_current大于$search_price_min，小于$search_price_max

这不管用..。

[You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '<= '100000' AND wposts.post_status = 'publish' AND wposts.post_type = 'vreb_' at line 11]

Answer 1

AND wpostmeta3.meta_value IS >= '$search_price_min' AND <= '$search_price_max'

需要的是

AND wpostmeta3.meta_value >= '$search_price_min'
AND wpostmeta3.meta_value <= '$search_price_max'

Answer 2

AND <= '$search_price_max'

那么<=应该是什么呢？您忽略了那个操作符的参数:这是错误。

也许你的意思是：

AND wpostmeta3.meta_value <= '$search_price_max'