SQL monthbase, show monthbase only once per day, left join

Question

I have added "Monthbase" to my Time table. Now I want to add it to the Fact table. Using a left join:

 SELECT t1.[Posting_Date]
       ,t1.[Quantity]
       ,t1.[EmployeeID] --added afterwards
       ,t2.[Monthbase]
   FROM [Fact table] t1 LEFT JOIN [Time table] t2
     ON t1.[Posting_Date] = t2.[Posting_Date]

But I only want to see the value (8) one time per day, when applicable. The Time table has already been created with all requirements regarding holidays etc.

Answer 1

Something like this:

;WITH CTE AS
(
  SELECT [EmployeeID],
        [Posting_Date]
       ,[Quantity]
       ,ROW_NUMBER() OVER (PARTITION BY [EmployeeID], [Posting_Date] ORDER BY [Quantity]) RN
   FROM [Fact table]
)
SELECT t1.[Posting_Date]
       ,t1.[EmployeeID]
       ,t1.[Quantity]
       ,CASE WHEN t1.RN = 1 THEN t2.[Monthbase] ELSE 0 END [Monthbase]
   FROM CTE t1
     LEFT JOIN [Time table] t2
       ON t1.[Posting_Date] = t2.[Posting_Date]