题解 | #统计每种性别的人数#
统计每种性别的人数
https://www.nowcoder.com/practice/f04189f92f8d4f6fa0f383d413af7cb8
select num.gender,count(num.gender) as number from
(select device_id,
if (
find_in_set ('male', profile) > 0,
'male',
'female'
) as gender
from
user_submit) as num
group by num.gender
通过find函数查找指定字符串，通过返回结果大于0则判断为真，否则为假
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