如何检索总计数答案

【问题标题】：How to retrieve the total count如何检索总计数
【发布时间】：2016-09-09 10:37:05
【问题描述】：

这是在 SQL Server 中运行的存储过程。我也想带出返回数据的总数。

ALTER PROCEDURE [dbo].[spManufacturerdata]
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;

-- Insert statements for procedure here
SELECT [t1].[OEMName] AS [oem], [t1].[OemId] AS [id]
FROM (
    SELECT DISTINCT [t0].[OEMName], [t0].[OemId]
    FROM [dbo].[tblOEM] AS [t0]
    WHERE [t0].[IsActive] = 1
    ) AS [t1]
order BY LOWER([t1].[OEMName])

END

提前致谢。

【问题讨论】：

样本数据和期望的结果将有助于解释您想要做什么。我不确定“返回数据的总数”应该是什么意思。
你不能简单地检查调用方的行数吗？

标签： sql-server stored-procedures sql-server-2008-r2

【解决方案1】：

添加分组方式：

SELECT COUNT([t1].[OemId]) AS TotalCount,[t1].[OEMName] AS [oem], [t1].[OemId] AS [id]
FROM (
    SELECT DISTINCT [t0].[OEMName], [t0].[OemId]
    FROM [dbo].[tblOEM] AS [t0]
    WHERE [t0].[IsActive] = 1
    ) AS [t1]
GROUP BY [t1].[OEMName] , [t1].[OemId] 
order BY LOWER([t1].[OEMName])

【讨论】：

【解决方案2】：

我意识到 COUNT() 或 COUNT(DISTINCT) 只会为每一行返回 1。

如果你想要所有行的总数，那么你想要这样的东西：

SELECT t.OEMName as oem, t.OemId as id,
       SUM(COUNT(*)) OVER () as total_rows,
       COUNT(*) OVER () as total_combinations
FROM dbo.tblOEM t
WHERE t.IsActive = 1
GROUP BY t.OEMName, t.OemId
ORDER BY LOWER(t.OEMName);

【讨论】：

【解决方案3】：

我不确定我是否理解你。如果要统计上一次选择返回的总记录数，只需要调用count()即可：

SELECT COUNT([t1].[OEMName]) AS totalRowsInPreviuosQuery
FROM (
    SELECT DISTINCT [t0].[OEMName], [t0].[OemId]
    FROM [dbo].[tblOEM] AS [t0]
    WHERE [t0].[IsActive] = 1
) AS [t1]

【讨论】：

【解决方案4】：

试试这个，

SELECT count(*) AS TotalCount
FROM (
    SELECT DISTINCT [t0].[OEMName]
        ,[t0].[OemId]
    FROM [dbo].[tblOEM] AS [t0]
    WHERE [t0].[IsActive] = 1
    ) AS [t1]

【讨论】：