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
gender,
count(device_id) as number
from
(
SELECT
device_id,
SUBSTRING_INDEX(profile, ',', -1) AS gender
from
user_submit
) t
group by
gender
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