SQL2、查询多列

思路：要取出的列是表的其中一些列，所以要明确命名。

代码解释：从表user_profile 中取出列 device_id、gender、age、university

SELECT 
    device_id, 
    gender, 
    age, 
    university
FROM 
    user_profile;

题目：https://www.nowcoder.com/practice/499b6d01eae342b2aaeaf4d0da61cab0?tpId=199&tags=&title=&difficulty=0&judgeStatus=0&rp=0&sourceUrl=%2Fexam%2Foj%3Fpage%3D1%26tab%3DSQL%25E7%25AF%2587%26topicId%3D199