SQL SI MOINS ET UNE PLUS GRANDE QUE dans la clause WHERE

Question

Je voudrais utiliser CASE QUAND ALORS dans WHERE ou la fonction agregat IIF ou autre chose qui fonctionne comme ceci:

@iKapacitet 
AS 
SELECT ID, Name 
FROM Private-Accommodation 
WHERE [Private-Accommodation].[Otok]='Rab'AND 
IIF(@iKapacitet = 1,[Private-Accommodation].[maxPersons] < 3, 
IIF(@iKapacitet = 2, [Private-Accommodation].[maxPersons] < 3 AND [Private-Accommodation].[maxPersons] > 5, 
[Private-Accommodation].[maxPersons] BETWEEN 4 AND 6)) 
ORDER BY [Private-Accommodation].[RedniBr] 

S'il est plus facile avec CASE:

CASE @iKapacitet 
WHEN 1 THEN (CASE [Private-Accommodation].[maxBrOsoba] WHEN < 3) 
WHEN 2 THEN (CASE [Private-Accommodation].[maxBrOsoba] WHEN < 3 AND > 5) 
WHEN 3 THEN (CASE [Private-Accommodation].[maxPersons] BETWEEN 4 AND 6) 
END 

Answer 1

Il est généralement plus clair de quitter la logique si/cas en dehors des clauses where. Vous pourriez envisager:

WHERE [Private-Accommodation].[Otok] = 'Rab' AND 
     ((@iKapacitet = 1 AND [Private-Accommodation].[maxPersons] < 3) OR 
     (@iKapacitet = 2 AND [Private-Accommodation].[maxPersons] < 3) AND [Private-Accommodation].[maxPersons] > 5) OR 
     (@iKapacitet NOT IN (1, 2) AND [Private-Accommodation].[maxPersons] BETWEEN 4 AND 6) 
    )