sql-server-2008 - SQL Server 2008 - 按大小写的错误顺序

Question

我收到以下错误消息：

消息 8120，级别 16，状态 1，第 1 行列“customers.member_category”在选择列表中无效，因为它既不包含在聚合函数中，也不包含在 GROUP BY 子句中。如果语句包含 UNION、INTERSECT 或 EXCEPT 运算符，则消息 104、级别 16、状态 1、行 1 ORDER BY 项必须出现在选择列表中。

如何按案例排序结果？

谢谢

SELECT
Date,
order_id,
member_category,
COUNT(*) AS no_items, 
SUM(item_amount) AS total_amount
FROM 
order_items OI (NOLOCK) JOIN customers C (NOLOCK) 
ON OI.CUSTOMER_NO = C.CUSTOMER_NO
WHERE 
DATE = '01 FEB 2014'
GROUP BY 
order_id, 
member_category
UNION
SELECT
    '',
    '',
'Total',
COUNT(*) AS no_items, 
SUM(item_amount) AS total_amount
FROM 
order_items OI (NOLOCK) JOIN customers C (NOLOCK) 
ON OI.CUSTOMER_NO = C.CUSTOMER_NO
WHERE 
DATE = '01 FEB 2014'
GROUP BY Date WITH ROLLUP
ORDER BY Date ASC, CASE member_category WHEN 'VIP' THEN 1
                    WHEN 'STD' THEN 2                   
                    WHEN 'GLD' THEN 3 
           END                                

Answer 1

您声明的第二部分UNION不包含 field member_category。这违反UNION了每个语句中列的数量和顺序应该相同的基本原则。

要解决此问题，您需要member_category在检索到的列列表和GROUP BY子句中都添加。