Question

我已经阅读了所有相关问题但却无法解决这个问题。我想连接这个查询的结果：

SELECT DISTINCT ord.uid AS u
  FROM  `uc_order_products` ord_prod,  `uc_orders` ord,  `uc_roles_expirations` re
WHERE ord.order_id = ord_prod.order_id
  AND ord_prod.title LIKE  '2012. évi%'
  AND ord.uid NOT 
IN (SELECT uid FROM uc_roles_expirations re)

看起来像这样：

U
----
1234
1235
...

这就是我的尝试：

SELECT GROUP_CONCAT(DISTINCT ord.uid AS u
  FROM  `uc_order_products` ord_prod,  `uc_orders` ord,  `uc_roles_expirations` re
WHERE ord.order_id = ord_prod.order_id
  AND ord_prod.title LIKE  '2012. évi%'
  AND ord.uid NOT 
IN (SELECT uid FROM uc_roles_expirations re) SEPARATOR ',')

..并没有奏效。你能帮帮我吗？

Answer 1

只有columnName应该在GROUP_CONCAT函数中。

SELECT GROUP_CONCAT(DISTINCT ord.uid SEPARATOR ',')AS u
FROM  `uc_order_products` ord_prod,  
        `uc_orders` ord,  
        `uc_roles_expirations` re
WHERE ord.order_id = ord_prod.order_id
  AND ord_prod.title LIKE  '2012. évi%'
  AND ord.uid NOT 
IN (SELECT uid FROM uc_roles_expirations re)

PS：作为旁注，由于此表uc_roles_expirations缺少连接条件，此uqery将产生笛卡尔结果。表格在另一张桌子上的关系是什么？

我不确定，但我认为你想要这个查询的结果，

SELECT GROUP_CONCAT(DISTINCT ord.uid SEPARATOR ',')AS u
FROM  `uc_order_products` ord_prod
       INNER JOIN `uc_orders` ord
          ON ord.order_id = ord_prod.order_id
WHERE ord_prod.title LIKE  '2012. évi%' AND 
      ord.uid NOT IN (SELECT uid FROM uc_roles_expirations)

Answer 2

select GROUP_CONCAT(u ORDER BY u)
from
(
SELECT DISTINCT ord.uid AS u
  FROM  `uc_order_products` ord_prod,  `uc_orders` ord,  `uc_roles_expirations` re
WHERE ord.order_id = ord_prod.order_id
  AND ord_prod.title LIKE  '2012. évi%'
  AND ord.uid NOT 
IN (SELECT uid FROM uc_roles_expirations re)
) t

如何连接此结果集？

2 个答案: