不去重手法
查找山东大学或者性别为男生的信息
https://www.nowcoder.com/practice/979b1a5a16d44afaba5191b22152f64a?tpId=199&tqId=1975677&ru=/exam/oj&qru=/ta/sql-quick-study/question-ranking&sourceUrl=%2Fexam%2Foj%3Ftab%3DSQL%25E7%25AF%2587%26topicId%3D199
不去重手法，注意用union all，如下
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'
