CONCAT（）的內部GROUP_CONCAT（）

Question

我有以下數據結果：

--------------------------------------------------------------------- 
| 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 | 
--------------------------------------------------------------------- 

通過此查詢：

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 

然後此：

-------------------------------------------------------------- 
| 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 | 
-------------------------------------------------------------- 

通過這樣的：

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 

我的問題是，我如何能實現我的數據變成一列：

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

我試圖包圍我concat()與group_concat()但是我收到一個錯誤：Invalid group function。

UPDATE

大道具爵士Giorgos Betsos爲正確答案。

現在這是我的查詢：

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，在調整我的查詢多一點，我的另一個問題：

我試圖拼接上新生成一個從另一個數據新查詢：

----------------------------------------------------------------------- 
| 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) | 
----------------------------------------------------------------------- 

在括號中的那些被稱爲SKU的，他們可以在wp_postmeta表中查到，但是他們是通過p.ID和p.post_id連接，但是與p.post_type = 'product'連接。

我試着用concat_ws()代替concat()，但沒有運氣。

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 

您的幫助是非常感謝。

非常感謝。

-Eli

Answer 1

這應該工作：

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：您可以添加你喜歡的任何分離器內GROUP_CONCAT，如：GROUP_CONCAT(order_items SEPARATOR '\n')。