访问替代EXCEPT子句

Question

如何在ms访问中获得与下面的SQL代码相同的结果？它不承认该EXCEPT条款......

SELECT DISTINCT 
       P.Name, 
       T.Training
  FROM Prof AS P, 
       Training_done AS TC, 
       Trainings AS T
 WHERE (P.Name Like '*' & NameProf & '*') 
   AND (P.Primary_Area = T.Cod_Area)
EXCEPT
SELECT DISTINCT 
       P.Name, 
       T.Training
  FROM Prof AS P, 
       Training_done AS TC, 
       Trainings AS T
 WHERE (P.Name Like '*' & NameProf & '*') 
   AND (P.Cod_Prof = TC.Cod_Prof);

提前致谢!

Answer 1

为了摆脱EXCEPT你,你可以结合条件,否定第二个:

SELECT DISTINCT 
       P.Name, 
       T.Training
  FROM Prof AS P, 
       Training_done AS TC, 
       Trainings AS T
 WHERE ((P.Name Like '*' & NameProf & '*') AND
        (P.Primary_Area = T.Cod_Area)) 
   AND NOT ((P.Name Like '*' & NameProf & '*') AND
            (P.Cod_Prof = TC.Cod_Prof));

Answer 2

SELECT A.x FROM A
EXCEPT
SELECT B.x FROM B

对应于

SELECT A.x FROM A 
LEFT JOIN B 
ON A.x = B.x 
WHERE B.x IS NULL