WordPress的選擇多個meta_keys？

Question

我可以做到這一點。

mysql> select * from wp_postmeta where post_id = '1304090'; 
+---------+---------+-------------------+--------------+ 
| meta_id | post_id | meta_key | meta_value | 
+---------+---------+-------------------+--------------+ 
| 4965987 | 1304090 | mp_tax_inclusive | 3 | 
| 4965988 | 1304090 | mp_tax_shipping | 5 | 
| 4965989 | 1304090 | mp_order_items | 1 | 
| 4965985 | 1304090 | mp_shipping_tax | 0 | 
+---------+---------+-------------------+--------------+ 

我現在想找到所有POST_ID的地方meta_key 「mp_tax_shipping」= 5，meta_key 「mp_tax_inclusive」= 3，我怎樣才能同時指定？我可以指定一個具有：

select * from wp_postmeta where meta_key = 'mp_tax_shipping' and meta_value = '5'

，但我需要兩個條件得到滿足。謝謝。

Answer 1

SELECT 
    pm.post_id 
FROM 
    wp_postmeta AS pm 
INNER JOIN 
    wp_postmeta AS pm2 ON pm2.post_id = pm.post_id 
WHERE pm.meta_key = 'mp_tax_shipping' AND pm.meta_value = '5' AND 
    pm2.meta_key = 'mp_tax_inclusive' AND pm2.meta_value = '3'