序言中的Concat原子并在答案中排除引号

Question

这是我的程序

clause1(A,Answer2):-
    atom_concat(A,' = 2',Answer),
    Answer2 = [Answer].

当我跑步时

?- clause1(var,Answer2).

我得到了

Answer2 = ['var = 2'].

但我想要

Answer2 = [var = 2].

Answer 1

这可以完成这项工作：

SELECT U.userFirst, U.userLast, C.clubName FROM club AS C
INNER JOIN vehicle AS V
    on C.clubID = V.clubID
INNER JOIN participant AS P
    on V.vehicleID = P.vehicleID
INNER JOIN user AS U
    on P.userID = U.userID        
ORDER BY C.clubName ASC

我认为你不能用空格[var = 2]

得到结果