题解 | #查找山东大学或者性别为男生的信息#
查找山东大学或者性别为男生的信息
https://www.nowcoder.com/practice/979b1a5a16d44afaba5191b22152f64a
# select device_id,gender,age,gpa from user_profile as a where a.university ='山东大学' or a.gender = 'male' SELECT device_id,gender,age,gpa FROM user_profile where university='山东大学' UNION ALL SELECT device_id,gender,age,gpa FROM user_profile where gender='male'
题目中提示不去重,所以要用UNION ALL。UNION或者where...or子句都会去重。