汇总案例陈述的输出

Question

我有这样的查询：

SELECT
 case [Group]
  when 1 then 'in'
  when 0 then 'out'
  end as traffic

 FROM [GW_Test_Back_Up].[dbo].[ARC_Calls_ReportView]

这会创建一个包含许多行的新列，其中包含输入/输出流量，但我真正想要的只有两行，一行用于输入的总和，另一行用于输出的总和。我被困在如何做到这一点。

Answer 1

我相信你是在追求：

SELECT
SUM(CASE WHEN [Group] = 1 then 1 ELSE 0 END ) AS InCount,
SUM(CASE WHEN [Group] = 0 then 1 ELSE 0 END ) AS OutCount
 FROM [GW_Test_Back_Up].[dbo].[ARC_Calls_ReportView]

或许这个：

SELECT 'InCount' AS Type,
SUM(CASE WHEN [Group] = 1 then 1 ELSE 0 END ) AS InCount
FROM [GW_Test_Back_Up].[dbo].[ARC_Calls_ReportView]
UNION ALL
SELECT 'OutCount' AS Type,
SUM(CASE WHEN [Group] = 0 then 1 ELSE 0 END ) AS OutCount
FROM [GW_Test_Back_Up].[dbo].[ARC_Calls_ReportView]

修改

SELECT 
CASE WHEN m.InCount > 10 THEN 'High' ELSE 'Low' END AS InCountStatus
CASE WHEN m.OutCount > 10 THEN 'High' ELSE 'Low' END AS OutCountStatus
FROM 
(
   SELECT
     SUM(CASE WHEN [Group] = 1 then 1 ELSE 0 END ) AS InCount,
     SUM(CASE WHEN [Group] = 0 then 1 ELSE 0 END ) AS OutCount
   FROM [GW_Test_Back_Up].[dbo].[ARC_Calls_ReportView]
) m