多个选择语句多个条件

Question

想知道是否有人可以帮助我对加入语句的查询。

我在某个时间段内将 1 个实践的每个专业的平均分数与该时间段内所有其他实践的每个代码的平均分数（但不包括我正在比较的那个）进行基准测试。 我想知道是否有办法加入我的陈述。 我当前的代码是分开做的。 我不能使用联合，因为它返回不同数量的行并且不查看相同的内容。 内部连接似乎也不起作用。 这一切都是从一个数据库/表中提取的。

所以基本上我希望在各自的列中加入两个复杂的查询，比较不同数据过滤器的结果。 因此，将 1 的平均值与所有的平均值进行比较。

这取自下表：

这是我的代码：

SELECT [specialty] as [Specialty]
      ,Replace([procedure_code],'.','') AS [Code]
      ,[procedure_description] as [Product Description]
      ,sum([cases]) as [Total Cases]
      ,AVG([Touchtime]) as [AVG Touchtime (mins)]
  FROM TableOutput
  where [trust_code] = 'RBA'
  AND [flag _emergency_case] = 'N' 
  AND [flag _cancellation] = 'N'
  AND CONVERT(datetime,date_of_visit,103) BETWEEN '2019/04/06 00:00:00.000' AND '2020/04/05 00:00:00.000'
  Group by [specialty]
      ,Replace([procedure_code],'.','')
      ,[procedure_description]
    

SELECT Replace([procedure_code],'.','') AS [Code]
      , AVG([Touchtime]) as [AVG Touchtime (mins)]
  FROM TableOutput
  where [region_code] = 'Y55'
  AND [trust_code] <> 'RBA'
  AND [flag _emergency_case] = 'N' 
  AND [flag _cancellation] = 'N'
  AND CONVERT(datetime,date_of_visit,103) BETWEEN '2019/04/06 00:00:00.000' AND '2020/04/05 00:00:00.000'
  Group by Replace([procedure_code],'.','')

Answer 1

您可以使用 Union 来连接这两个查询。 我看到它们都没有相同数量的列，但是在这种情况下，第一个查询只有五列，第二个查询与第一列有两个匹配，您可以将其余列添加为空。

SELECT [specialty] as [Specialty]
      ,Replace([procedure_code],'.','') AS [Code]
      ,[procedure_description] as [Product Description]
      ,sum([cases]) as [Total Cases]
      ,AVG([Touchtime]) as [AVG Touchtime (mins)]
  FROM TableOutput
  where [trust_code] = 'RBA'
  AND [flag _emergency_case] = 'N' 
  AND [flag _cancellation] = 'N'
  AND CONVERT(datetime,date_of_visit,103) BETWEEN '2019/04/06 00:00:00.000' AND '2020/04/05 00:00:00.000'
  Group by [specialty]
      ,Replace([procedure_code],'.','')
      ,[procedure_description]
    
UNION ALL 

SELECT 
null as [Specialty]
,Replace([procedure_code],'.','') AS [Code]
, null as [Product Description]
, null as [Total Cases]
, AVG([Touchtime]) as [AVG Touchtime (mins)]
  FROM TableOutput
  where [region_code] = 'Y55'
  AND [trust_code] <> 'RBA'
  AND [flag _emergency_case] = 'N' 
  AND [flag _cancellation] = 'N'
  AND CONVERT(datetime,date_of_visit,103) BETWEEN '2019/04/06 00:00:00.000' AND '2020/04/05 00:00:00.000'
  Group by Replace([procedure_code],'.','')

这应该可以工作，如果您需要区分数据来自哪个查询的数据，您可以添加另一列以进一步过滤掉它。 我添加了一个[Type]列：

SELECT [specialty] as [Specialty]
      ,Replace([procedure_code],'.','') AS [Code]
      ,[procedure_description] as [Product Description]
      ,sum([cases]) as [Total Cases]
      ,AVG([Touchtime]) as [AVG Touchtime (mins)]
      , 'FromRBA' as [Type]
  FROM TableOutput
  where [trust_code] = 'RBA'
  AND [flag _emergency_case] = 'N' 
  AND [flag _cancellation] = 'N'
  AND CONVERT(datetime,date_of_visit,103) BETWEEN '2019/04/06 00:00:00.000' AND '2020/04/05 00:00:00.000'
  Group by [specialty]
      ,Replace([procedure_code],'.','')
      ,[procedure_description]

UNION ALL 

SELECT 
null as [Specialty]
,Replace([procedure_code],'.','') AS [Code]
, null as [Product Description]
, null as [Total Cases]
, AVG([Touchtime]) as [AVG Touchtime (mins)]
, 'NotFromRBA' as [Type]
  FROM TableOutput
  where [region_code] = 'Y55'
  AND [trust_code] <> 'RBA'
  AND [flag _emergency_case] = 'N' 
  AND [flag _cancellation] = 'N'
  AND CONVERT(datetime,date_of_visit,103) BETWEEN '2019/04/06 00:00:00.000' AND '2020/04/05 00:00:00.000'
  Group by Replace([procedure_code],'.','')