Question

我一直在尝试使用Microsoft SQL Server 2008 R2进行查询，按间隔对总点数进行分组。但是，我无法让这个工作。这是我的代码：

SELECT interval_total, COUNT(*) FROM(
SELECT clients.clientId, total.TotalPoints,
CASE
    WHEN TotalPuntos >=5000 THEN 5000
    WHEN TotalPuntos >= 1000 THEN 1000
    WHEN TotalPuntos >= 500 THEN 500
    WHEN TotalPuntos >= 100 THEN 100
    ELSE 0
END as interval_total
FROM
    [TotalSumOfPoints] total,
    [Client] clients
WHERE total.clientId = clients.clientId
AND clients.cardId LIKE '2001%')
GROUP BY interval_total

出现此错误：

Msg 156, Level 15, State 1, Line 17
Incorrect syntax near the keyword 'GROUP'.

我一直在阅读不同的帖子，并得出结论是可以通过将CASE语句放在子查询中来进行这种查询（我得出这个结论，阅读this帖子）。显然我做错了什么。有什么帮助吗？

Answer 1

您的问题只是您需要为子查询提供别名，如下所示：

SELECT interval_total, COUNT(*) FROM(
SELECT clients.clientId, total.TotalPoints,
CASE
    WHEN TotalPuntos >=5000 THEN 5000
    WHEN TotalPuntos >= 1000 THEN 1000
    WHEN TotalPuntos >= 500 THEN 500
    WHEN TotalPuntos >= 100 THEN 100
    ELSE 0
END as interval_total
FROM
    [TotalPuntosPorCuenta] total,
    [SanRoque].[dbo].[Socio] clients
WHERE total.clientId = clients.clientId
AND clients.cardId LIKE '2001%') tbl /* <--- here */
GROUP BY interval_total

对Group By子句使用case语句

1 个答案: