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 where university ='山东大学' union all select device_id, gender, age, gpa from user_profile where gender ='male'
用or写了半天，看到题解才懂，题目要的是分别查看、不去重，所以用union all
