获取表列中每个值的计数

Question

我正在使用SQL Server 2008，并且我有一个表中包含“状态”列。有五种可能的状态：已提交，正在进行，已删除，已实施，未实施。

我正在尝试编写一个SQL语句，它将返回每个状态的计数但我的代码要么返回数字状态，要么返回特定状态的计数。以下是我的工作内容：

SELECT     COUNT(ServiceAreaID) AS ServiceArea
FROM         Suggestions
WHERE     (ServiceAreaID = 6)

或者这个

SELECT     COUNT(DISTINCT ServiceAreaID) AS ServiceArea
FROM         Suggestions

Answer 1

一个人：

SELECT Status, COUNT(*)
FROM dbo.Suggestions
WHERE ServiceAreaID = 6
GROUP BY Status;

为了所有人：

SELECT ServiceAreaID, Status, COUNT(*)
FROM dbo.Suggestions
GROUP BY ServiceAreaID, Status;

Answer 2

select ServiceAreaID,count(*),status
from suggestion
group by status,suggestion;

Answer 3

SELECT ServiceAreaID, COUNT(*) AS ServiceArea
FROM Suggestions
GROUP BY ServiceAreaID

这应该给你一个每个服务区id的计数。用您的状态替换组中的服务区域ID（下面包括一个与serviceAreaID分开的状态列，如果需要的话）。

 SELECT ServiceAreaID, status, COUNT(*) AS count
    FROM Suggestions
    GROUP BY ServiceAreaID, status

Answer 4

我认为你所寻找的是这样的：

SELECT ServiceAreaID, COUNT(ServiceAreaID) AS COUNT
FROM Suggestions
GROUP BY ServiceAreaID

我没有在您的SQL示例中看到Status列，但如果应该是一个，则查询将更像这样：

这个答案与Aaron的答案基本相同，所以如果您正在寻找这个答案，请务必将Aaron标记为答案。

SELECT ServiceAreaID, Status, COUNT(*) AS COUNT
FROM Suggestions
GROUP BY ServiceAreaID, Status