WHERE 子句中，表达式“age between 20 and 30”等同于？
A.age >= 20 and age <= 30 B.age >= 20 or age <=30 C.age > 20 and age < 30 D.age > 20 and age < 30正确答案A
WHERE 子句中，表达式“age between 20 and 30”等同于？
A.age >= 20 and age <= 30 B.age >= 20 or age <=30 C.age > 20 and age < 30 D.age > 20 and age < 30正确答案A
