选择查询星期几

Question

当使用以下查询返回一周中的几天时，我只想显示特定的一天（例如星期一）并计算返回“星期一”的次数。

     SELECT
      w.[Id]
    , w.[Name]
    , [Status]
    , [InitiatorPersonAliasId]
    , p.[FirstName]
    , p.[LastName]
    , ( SELECT TOP 1 [Value]
        FROM [AttributeValue] av
        INNER JOIN [Attribute] a ON a.[Id] = av.[AttributeId] 
        AND a.[EntityTypeId] = 113 
        AND a.[EntityTypeQualifierColumn] = 'WorkflowTypeId' 
        AND a.[EntityTypeQualifierValue] = w.[WorkflowTypeId]
        WHERE [EntityId] = w.[Id] 
        AND a.[Key] = 'DayOfTheWeek'
      ) AS [Day]
    , (SELECT TOP 1 [Value]
        FROM [AttributeValue] av
        INNER JOIN [Attribute] a ON a.[Id] = av.[AttributeId] 
        AND a.[EntityTypeId] = 113 
        AND a.[EntityTypeQualifierColumn] = 'WorkflowTypeId' 
        AND a.[EntityTypeQualifierValue] = w.[WorkflowTypeId]
        WHERE [EntityId] = w.[Id] 
        AND a.[Key] = 'Time'
      ) AS [Time]
FROM
[Workflow] w
INNER JOIN [PersonAlias] pa ON pa.Id = w.[InitiatorPersonAliasId]
INNER JOIN [Person] p ON p.[Id] = pa.[PersonId] 
WHERE w.[WorkflowTypeId] = 1032

非常感谢任何帮助。

谢谢！

Answer 1

你可以写成：

;With cte_DayCount as
(
        SELECT av.[Value] as DayCount,w.[Id]  AS Id
        FROM [AttributeValue] av
        INNER JOIN [Workflow] w ON av.[EntityId] = w.[Id] 
        INNER JOIN [Attribute] a ON a.[Id] = av.[AttributeId]         
        AND a.[EntityTypeId] = 113 
        AND a.[EntityTypeQualifierColumn] = 'WorkflowTypeId' 
        AND a.[EntityTypeQualifierValue] = w.[WorkflowTypeId]
        AND a.[Key] = 'DayOfTheWeek'
        WHERE [Value] Like '%Monday%' -- Add day value here
        GROUP BY w.[Id], av.Value 
)                
SELECT COUNT(dc.DayCount) AS Total

FROM
[Workflow] w
INNER JOIN [PersonAlias] pa ON pa.Id = w.[InitiatorPersonAliasId]
INNER JOIN [Person] p ON p.[Id] = pa.[PersonId] 
INNER JOIN cte_DayCount dc ON DC.Id = w.[Id]
WHERE w.[WorkflowTypeId] = 1032