SQL计数麻烦

Question

我有以下场景:

我需要计算有多少客户处于未付款状态。并且此计数必须仅显示计数 >= 2 的计数。这部分我做得正确(我认为):

--SELECTING Client Count
SELECT Client, COUNT(HyphenStatus) as UnpaidCount
FROM CasesFromSimplicity
WHERE HyphenStatus = 'UnPaid' AND FCManager = 'Mike'
GROUP BY Client
HAVING COUNT(HyphenStatus) >= 2
ORDER BY Client ASC

然后我需要为经理 View 创建一个如下所示的表:

+-----------+--------------+----------------+------------+
| FCManager | CountingTwos | CountingThrees | FourOrMore |
+-----------+--------------+----------------+------------+
| Mike      |            2 |              1 |          1 |
+-----------+--------------+----------------+------------+

这告诉我，我的顾问 Mike 有两个客户，计数为 2，一个客户计数为 3 和 一个客户端计数为 4。

我目前已经进行了以下查询，但这似乎不起作用。

--Selecting the count for manager
SELECT
FCManager
,(SELECT COUNT(HyphenStatus) FROM CasesFromSimplicity WHERE HyphenStatus = 'UnPaid' AND FCManager = 'Mike' HAVING COUNT(HyphenStatus) = 2) CountingTwos
,(SELECT COUNT(HyphenStatus) FROM CasesFromSimplicity WHERE HyphenStatus = 'UnPaid' AND FCManager = 'Mike' HAVING COUNT(HyphenStatus) = 3) CountingThrees
,(SELECT COUNT(HyphenStatus) FROM CasesFromSimplicity WHERE HyphenStatus = 'UnPaid' AND FCManager = 'Mike' HAVING COUNT(HyphenStatus) >= 4) FourOrMore
FROM CasesFromSimplicity
GROUP BY FCManager

有人可以告诉我我做错了什么吗？或者将我发送到正确的位置来阅读此内容。我在搜索时找不到任何东西。 我在发帖时一直在想，我需要在子查询中使用分组依据，但这会返回超过 1 个结果并且不起作用？

我创建了一个SQL Fiddle让您实时查看我的问题。

如有任何帮助，我们将不胜感激，谢谢迈克。

如果我需要进一步解释，请告诉我？我正在使用SQL SERVER 2008

Answer 1

好吧，假设 SQL Server 2005+，您可以这样做:

;WITH CTE AS
(
    SELECT  FCManager,
            Client, 
            COUNT(HyphenStatus) as UnpaidCount
    FROM CasesFromSimplicity
    WHERE HyphenStatus = 'UnPaid' 
    GROUP BY FCManager,
             Client
    HAVING COUNT(HyphenStatus) >= 2
)
SELECT  FCManager,
        SUM(CASE WHEN UnpaidCount = 2 THEN 1 ELSE 0 END) CountingTwos,
        SUM(CASE WHEN UnpaidCount = 3 THEN 1 ELSE 0 END) CountingThrees,
        SUM(CASE WHEN UnpaidCount > 3 THEN 1 ELSE 0 END) FourOrMore 
FROM CTE 
GROUP BY FCManager

Here is修改后的sqlfiddle。