题解 | #用where过滤空值练习#
用where过滤空值练习
https://www.nowcoder.com/practice/08c9846a423540319eea4be44e339e35
select device_id, gender, age, university from user_profile where age is not null;
过滤空值NUll,通过 is NULL 或者 is NOT NULL 来实现,空值与空字符是不同的,需要注意
用where过滤空值练习
https://www.nowcoder.com/practice/08c9846a423540319eea4be44e339e35
select device_id, gender, age, university from user_profile where age is not null;
过滤空值NUll,通过 is NULL 或者 is NOT NULL 来实现,空值与空字符是不同的,需要注意
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