CONCAT（）的内部GROUP_CONCAT（）

Question

我有以下数据结果：

--------------------------------------------------------------------- 
| id |  date  |    order_items   | qty | 
--------------------------------------------------------------------- 
| 1460 | 2017-03-24 | Alfonso XO      | 2 | 
| 1460 | 2017-03-24 | Godiva Dark 85% Cacao    | 3 | 
| 1460 | 2017-03-24 | Godiva Gold Rigid Ballotin 14pcs | 5 | 
--------------------------------------------------------------------- 

通过此查询：

SELECT 
    p.ID, 
    date(p.post_date) AS date, 
    i.order_item_name AS order_items 
    max(CASE WHEN o.meta_key = '_qty' AND i.order_item_id = o.order_item_id THEN o.meta_value END) AS qty 
FROM wp_posts AS p 
LEFT JOIN wp_woocommerce_order_items AS i ON p.ID = i.order_id 
LEFT JOIN wp_woocommerce_order_itemmeta AS o ON i.order_item_id = o.order_item_id 
WHERE p.ID = 1460 AND i.order_item_type = 'line_item' 
GROUP BY i.order_item_name 

然后此：

-------------------------------------------------------------- 
| id |  date  |    order_items   | 
-------------------------------------------------------------- 
| 1460 | 2017-03-24 | 2 Alfonso XO      | 
| 1460 | 2017-03-24 | 3 Godiva Dark 85% Cacao    | 
| 1460 | 2017-03-24 | 5 Godiva Gold Rigid Ballotin 14pcs | 
-------------------------------------------------------------- 

通过这样的：

SELECT 
    p.ID, 
    date(p.post_date) AS date, 
    concat(max(CASE WHEN imeta.meta_key = '_qty' and items.order_item_id = imeta.order_item_id THEN imeta.meta_value END), ' ', items.order_item_name) as order_items 
FROM wp_posts AS p 
LEFT JOIN wp_woocommerce_order_items AS i ON p.ID = i.order_id 
LEFT JOIN wp_woocommerce_order_itemmeta AS o ON i.order_item_id = o.order_item_id 
WHERE p.ID = 1460 AND i.order_item_type = 'line_item' 
GROUP BY i.order_item_name 

我的问题是，我如何能实现我的数据变成一列：

-------------------------------------------------------------- 
| id |  date  |    order_items   | 
-------------------------------------------------------------- 
|  |    | 2 Alfonso XO      | 
| 1460 | 2017-03-24 | 3 Godiva Dark 85% Cacao    | 
|  |    | 5 Godiva Gold Rigid Ballotin 14pcs | 
-------------------------------------------------------------- 

我试图包围我concat()与group_concat()但是我收到一个错误：Invalid group function。

UPDATE

大道具爵士Giorgos Betsos为正确答案。

现在这是我的查询：

SELECT ID, post_date, GROUP_CONCAT(order_items separator '\n') AS order_items, post_status, shipping_flight_number, letter_code, terminal, order_total, full_name 
FROM (
    SELECT 
    p.ID, 
    date(p.post_date) AS post_date, 
    p.post_status AS post_status, 
    concat(max(CASE 
       WHEN o.meta_key = '_qty' and 
         i.order_item_id = o.order_item_id 
        THEN o.meta_value 
       END), ' ', i.order_item_name) as order_items, 
    max(CASE WHEN pm.meta_key = 'shipping_flight_number' and p.ID = pm.post_id THEN pm.meta_value END) as shipping_flight_number, 
    substring_index(max(CASE WHEN pm.meta_key = 'shipping_flight_number' and p.ID = pm.post_id THEN pm.meta_value END)," ",1) as letter_code, 
    (select terminal_id from wp_shipping_airlines where letter_code = substring_index(max(CASE WHEN pm.meta_key = 'shipping_flight_number' and p.ID = pm.post_id THEN pm.meta_value END)," ",1)) as terminal, 
    max(CASE WHEN pm.meta_key = '_order_total' and p.ID = pm.post_id THEN pm.meta_value END) as order_total, 
    concat(max(CASE WHEN pm.meta_key = '_billing_first_name' and p.ID = pm.post_id THEN pm.meta_value END), ' ', max(CASE WHEN pm.meta_key = '_billing_last_name' and p.ID = pm.post_id THEN pm.meta_value END)) as full_name 
FROM wp_posts AS p 
LEFT JOIN wp_postmeta pm on p.ID = pm.post_id 
LEFT JOIN wp_woocommerce_order_items AS i ON p.ID = i.order_id 
LEFT JOIN wp_woocommerce_order_itemmeta AS o ON i.order_item_id = o.order_item_id 
WHERE p.post_type = 'shop_order' AND i.order_item_type = 'line_item' AND p.post_status != 'trash' 
GROUP BY i.order_item_name, p.ID) AS t 
GROUP BY ID, post_date, shipping_flight_number, letter_code, terminal, order_total, full_name 

然而，在调整我的查询多一点，我的另一个问题：

我试图拼接上新生成一个从另一个数据新查询：

----------------------------------------------------------------------- 
| id |  date  |     order_items     | 
----------------------------------------------------------------------- 
|  |    | 2 Alfonso XO (2300551)      | 
| 1460 | 2017-03-24 | 3 Godiva Dark 85% Cacao (2657010)   | 
|  |    | 5 Godiva Gold Rigid Ballotin 14pcs (2421181) | 
----------------------------------------------------------------------- 

在括号中的那些被称为SKU的，他们可以在wp_postmeta表中查到，但是他们是通过p.ID和p.post_id连接，但是与p.post_type = 'product'连接。

我试着用concat_ws()代替concat()，但没有运气。

SELECT ID, post_date, GROUP_CONCAT(order_items separator '\n') AS order_items, post_status, shipping_flight_number, letter_code, terminal, order_total, full_name 
FROM (
    SELECT 
    p.ID, 
    date(p.post_date) AS post_date, 
    p.post_status AS post_status, 
    concat_ws(' ', max(CASE 
       WHEN o.meta_key = '_qty' and 
         i.order_item_id = o.order_item_id 
        THEN o.meta_value 
       END), i.order_item_name, ' -- ', max(CASE WHEN pm.meta_key = '_sku' and p.ID = pm.post_id and p.post_type = 'product' THEN pm.meta_value END)) as order_items, 
    max(CASE WHEN pm.meta_key = 'shipping_flight_number' and p.ID = pm.post_id THEN pm.meta_value END) as shipping_flight_number, 
    substring_index(max(CASE WHEN pm.meta_key = 'shipping_flight_number' and p.ID = pm.post_id THEN pm.meta_value END)," ",1) as letter_code, 
    (select terminal_id from wp_shipping_airlines where letter_code = substring_index(max(CASE WHEN pm.meta_key = 'shipping_flight_number' and p.ID = pm.post_id THEN pm.meta_value END)," ",1)) as terminal, 
    max(CASE WHEN pm.meta_key = '_order_total' and p.ID = pm.post_id THEN pm.meta_value END) as order_total, 
    concat(max(CASE WHEN pm.meta_key = '_billing_first_name' and p.ID = pm.post_id THEN pm.meta_value END), ' ', max(CASE WHEN pm.meta_key = '_billing_last_name' and p.ID = pm.post_id THEN pm.meta_value END)) as full_name 
FROM wp_posts AS p 
LEFT JOIN wp_postmeta pm on p.ID = pm.post_id 
LEFT JOIN wp_woocommerce_order_items AS i ON p.ID = i.order_id 
LEFT JOIN wp_woocommerce_order_itemmeta AS o ON i.order_item_id = o.order_item_id 
WHERE p.post_type = 'shop_order' AND i.order_item_type = 'line_item' AND p.post_status != 'trash' 
GROUP BY i.order_item_name, p.ID) AS t 
GROUP BY ID, post_date, shipping_flight_number, letter_code, terminal, order_total, full_name 

您的帮助是非常感谢。

非常感谢。

-Eli

Answer 1

这应该工作：

SELECT ID, date, GROUP_CONCAT(order_items) AS order_items 
FROM (
    SELECT 
     p.ID, 
     date(p.post_date) AS date, 
     concat(max(CASE 
        WHEN imeta.meta_key = '_qty' and 
          items.order_item_id = imeta.order_item_id 
         THEN imeta.meta_value 
        END), ' ', items.order_item_name) as order_items 
FROM wp_posts AS p 
LEFT JOIN wp_woocommerce_order_items AS i ON p.ID = i.order_id 
LEFT JOIN wp_woocommerce_order_itemmeta AS o ON i.order_item_id = o.order_item_id 
WHERE p.ID = 1460 AND i.order_item_type = 'line_item' 
GROUP BY i.order_item_name) AS t 
GROUP BY ID, date 

注意：您可以添加你喜欢的任何分离器内GROUP_CONCAT，如：GROUP_CONCAT(order_items SEPARATOR '\n')。