题解 | 用where过滤空值练习
用where过滤空值练习
https://www.nowcoder.com/practice/08c9846a423540319eea4be44e339e35?tpId=199&tqId=1971604&sourceUrl=%2Fexam%2Foj%3Fpage%3D1%26tab%3DPython%25E7%25AF%2587%26topicId%3D199
select device_id, gender, age, university from user_profile where age is not NULL