Question

SELECT wp_terms.name AS 'Exam',   
       (SELECT wp_postmeta.meta_value
        FROM wp_postmeta
        WHERE wp_postmeta.meta_key in ('_order_total') ),  
       wp.id,  
       wp_woocommerce_order_itemmeta.meta_value AS 'Product Id',  
       f.order_item_name,
       (SELECT wp_postmeta.meta_value
        FROM wp_postmeta
        WHERE wp_postmeta.meta_key in ('_billing_email'))  
FROM wp_term_taxonomy
  INNER JOIN wp_terms ON wp_terms.term_id = wp_term_taxonomy.term_id  
  INNER JOIN wp_term_relationships ON wp_term_relationships.term_taxonomy_id = wp_term_taxonomy.term_taxonomy_id  
  INNER JOIN wp_woocommerce_order_itemmeta ON wp_woocommerce_order_itemmeta.meta_value = wp_term_relationships.object_id  
  INNER JOIN (SELECT f.order_item_id,  
                     f.order_id,  
                     f.order_item_name  
              FROM wp_woocommerce_order_items f) f ON f.order_item_id = wp_woocommerce_order_itemmeta.order_item_id  
  INNER JOIN wp_postmeta ON wp_postmeta.post_id = f.order_id  
  INNER JOIN (SELECT wp.id,  
              FROM wp_posts wp
                INNER JOIN wp_postmeta wm ON wp.id = wm.post_id  
              WHERE wp.post_type = 'shop_order'  
              AND   wp.post_status = 'wc-completed'  AND   wm.meta_key = '_completed_date') wp ON wp.id = wp_postmeta.post_id  
WHERE wp_term_taxonomy.taxonomy = 'product_cat'  
AND   wp_term_taxonomy.term_id IN (2825,2829,2833,2837,2844,2851,2847)  
AND   wp_woocommerce_order_itemmeta.meta_key = '_product_id'  
AND   wp_postmeta.meta_key IN ('_order_total','_billing_email')

上面的sql查询抛出子查询返回多行错误。我希望列中的帐单地址和另一列中的订单总数。怎么做？

Answer 1

正如vims所说，你在wp_postmeta的2个子选择中有多行。事实上，你不会通过id或类似的东西加入它们，例如

SELECT wp_postmeta.meta_value
    FROM wp_postmeta
    WHERE wp_postmeta.meta_key in ('_order_total')

将使用key =＆＃39; _order_total＆＃39;

返回数据库中的所有行

同样适用于

SELECT wp_postmeta.meta_value
        FROM wp_postmeta
        WHERE wp_postmeta.meta_key in ('_billing_email'))

所以，你应该在一些id上添加一个join子句给它们。对不起，我不是WP和\或WooCommerce的专家，所以我不能给你一个关于哪个领域使用的提示。

此外，您应该将这些子选择放在FROM和WHERE部分或您的选择中。选择列表中的子选择不是一个好习惯。

Answer 2

子查询不仅限于所讨论的post_id。因此，您获得所有帖子的order_totals。在每个子查询中添加这样的内容：

AND f.order_id = post_id

Answer 3

compute geometric measures

sql子查询返回多于1行的错误

3 个答案: