Woocommerce-從訂購的產品中獲取元數據

Question

我想從一個月以來的全部訂單中獲取產品的元數據（_wcj_purchase_price）。

我嘗試使用MYSQL和WP_Query，但很快就迷失了。

實際上，我具有該產品的meta_value：

SELECT post_id as order_id, meta_key, meta_value from wp_postmeta where post_id in ( SELECT ID FROM wp_posts中SELECT post_id as order_id, meta_key, meta_value from wp_postmeta where post_id in ( SELECT ID FROM wp_posts中， WHERE post_type = 'shop_order' and post_date BETWEEN NOW() - INTERVAL 30 DAY AND NOW() )
and meta_key = '_wcj_purchase_price' WHERE post_type = 'shop_order' and post_date BETWEEN NOW() - INTERVAL 30 DAY AND NOW() )
and meta_key = '_wcj_purchase_price'

但我不知道要為每個訂購的產品獲得此價值。

Answer 1

在@ dan-webb的幫助下，我得到了以下結果：

SELECT post_id as order_id, meta_key, meta_value from wp_postmeta where post_id in ( SELECT ID FROM wp_posts中SELECT post_id as order_id, meta_key, meta_value from wp_postmeta where post_id in ( SELECT ID FROM wp_posts中， WHERE post_type = 'shop_order' and post_date BETWEEN NOW() - INTERVAL 30 DAY AND NOW() )
and meta_key = '_wcj_purchase_price' WHERE post_type = 'shop_order' and post_date BETWEEN NOW() - INTERVAL 30 DAY AND NOW() )
and meta_key = '_wcj_purchase_price'

但是它返回的是產品元數據，而不是訂購的產品。

Answer 2

MySQL的方式是：

SELECT post_id as order_id, meta_key, meta_value from wp_postmeta where post_id in
         ( SELECT ID FROM `wp_posts`  
           WHERE post_type = 'shop_order' and post_date BETWEEN NOW() - INTERVAL 30 DAY AND NOW()
          )                                         
and meta_key  = '_wcj_purchase_price'