Jak wybrać kolumnę na podstawie warunku?

Question

Mam zmienną o nazwie @status które postawił przed tym select:

Select 
ordr_num as num, 
ordr_date as date, 
ordr_ship_with as shipwith 
From 
order 
where ordr_num = @ordrNum 

Chcę tylko zaznaczyć ordr_ship_with kolumnę jeśli @status <> 'Cancelled', inaczej chcę wybrać null dla shipwith. Jak to zrobić?

Answer 1

SELECT ordr_num as num, ordr_date as date, 
    CASE WHEN @status<>'Cancelled' THEN ordr_ship_with ELSE NULL END as shipwith 
FROM order 
WHERE ordr_num = @ordrNum 

Answer 2

Spróbuj tego

Select 
    ordr_num as num, 
    ordr_date as date, 
    CASE 
     WHEN @Status <> 'Cancelled' THEN ordr_ship_with 
     ELSE NULL END 
    as shipwith 
From order 
where ordr_num = @ordrNum 

Choć mam wrażenie, że status jest rzeczywisty kolumna w tabeli Zamówienia. W takim przypadku to zrobić:

Select 
    ordr_num as num, 
    ordr_date as date, 
    CASE 
     WHEN Status <> 'Cancelled' THEN ordr_ship_with 
     ELSE NULL END 
    as shipwith 
From order 
where ordr_num = @ordrNum 

Answer 3

SELECT CASE
KIEDY @status <> 'odwołany' THEN ordr_ship_with
ELSE NULL
koniec, jak shipwith ... inne pola

Answer 4

przypadków użycia: http://msdn.microsoft.com/en-us/library/ms181765.aspx

Answer 5

Select 
    ordr_num as num, 
    ordr_date as date, 
    CASE WHEN @status <> 'Cancelled' THEN ordr_ship_with ELSE NULL END as shipwith 
From 
    order where ordr_num = @ordrNum