試題詳解

18.有SQL语句：SELECT * FROM教师WHERE NOT(工资>3000 OR 工资<2000)与如上语句等价的SQL语句是
(A)、SELECT*FROM 教师 HWERE 工资 BETWEEN 2000 AND 3000
(B)、SELECT*FROM 教师 HWERE 工资 >2000 AND 工资<3000
(C)、SELECT*FROM 教师 HWERE 工资>2000 OR 工资<3000
(D)、SELECT*FROM 教师 HWERE 工资<=2000 AND 工资>=3000