從查詢結果中減去1

Question

SELECT count(P.pID) 
FROM Department D, Professor P 
WHERE D.dID = ? AND P.dID = D.dID; 

我想從count(P.pID)的任何結果中減去'1'。因此，例如，如果P.pID的值是10，它會輸出9 ... ??

Answer 1

SELECT count(P.pID) - 1 as pID_count 
FROM Department D, Professor P 
WHERE D.dID = ? AND P.dID = D.dID; 

Answer 2

什麼

SELECT count(P.pID) - 1 
FROM Department D, Professor P 
WHERE D.dID = ? AND P.dID = D.dID; 

Answer 3

SELECT count(P.pID)-1 
FROM Department D, Professor P 
WHERE D.dID = ? AND P.dID = D.dID;