题解 | #用where过滤空值练习#
用where过滤空值练习
http://www.nowcoder.com/practice/08c9846a423540319eea4be44e339e35
select device_id,gender,age,university from user_profile where age is not null;
用where过滤空值练习
http://www.nowcoder.com/practice/08c9846a423540319eea4be44e339e35
select device_id,gender,age,university from user_profile where age is not null;
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