Yurttas/PL/DBL/mysql/F/01/00/PC/q05.sql

 1/*
 2REM
 3REM q05.sql
 4REM
 5REM Find those manufacturers that sell Laptops, but not PC's.
 6REM
 7*/
 8
 9\. set-db.sql
10
11(SELECT P.maker
12 FROM Product P, Laptop L
13 WHERE P.model=L.model)
14MINUS
15(SELECT P.maker
16 FROM Product P, PC
17 WHERE P.model=PC.model);