Clause WHERE SQL Server utilisant des colonnes temporaires

Question

J'ai la requête suivante, qui utilise une instruction CASE. Existe-t-il un ajout à la clause where WHERE IsBusinessDayFinal = 0? sans utiliser une table temporaire?

merci beaucoup!

SELECT 
     ac.DateTimeValue, 
     CASE 
      WHEN pc.IsBusinessDay IS NOT NULL THEN pc.IsBusinessDay 
      ELSE ac.IsBusinessDay 
     END AS IsBusinessDayFinal, 
     ac.FullYear, 
     ac.MonthValue, 
     ac.DayOfMonth, 
     ac.DayOfWeek, 
     ac.Week 
    FROM 
     [dbo].[AdminCalendar] ac LEFT JOIN 
     [dbo].ProjectCalendar pc ON ac.DateTimeValue = pc.DateTimeValue AND pc.ProjectId = @projectId 
    WHERE ac.DateTimeValue >= @startDate AND ac.DateTimeValue <= @finishDate; 

Answer 1

Utilisez

WHERE (pc.IsBusinessDay IS NULL AND ac.IsBusinessDay = 0) 
OR pc.IsBusinessDay = 0 

Answer 2

WHERE ac.DateTimeValue >= @startDate AND ac.DateTimeValue <= @finishDate 
     AND ((pc.IsBusinessDay IS NOT NULL AND pc.IsBusinessDay = 0) OR ac.IsBusinessDay = 0) 

Answer 3

Vous pouvez utiliser COALESCE au lieu de CASE parce que vous vérifiez pour null:

SELECT ac.DateTimeValue, 
     COALESCE(pc.IsBusinessDay, ac.IsBusinessDay) AS IsBusinessDayFinal, 
     ac.FullYear, 
     ac.MonthValue, 
     ac.DayOfMonth, 
     ac.DayOfWeek, 
     ac.Week 
    FROM [dbo].[AdminCalendar] ac 
LEFT JOIN [dbo].ProjectCalendar pc ON ac.DateTimeValue = pc.DateTimeValue 
            AND pc.ProjectId = @projectId 
WHERE ac.DateTimeValue >= @startDate 
AND ac.DateTimeValue <= @finishDate 
AND COALESCE(pc.IsBusinessDay, ac.IsBusinessDay) = 0