题解 | #用where过滤空值练习#
用where过滤空值练习
https://www.nowcoder.com/practice/08c9846a423540319eea4be44e339e35
#两种方式 #1 使用is not null select device_id,gender,age,university from user_profile where age is not null #2 使用!=或者<> select device_id,gender,age,university from user_profile where age <> ""
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