题解 | #统计每种性别的人数#
统计每种性别的人数
http://www.nowcoder.com/practice/f04189f92f8d4f6fa0f383d413af7cb8
substr(字符串，开始索引，(结束索引))
SELECT
SUBSTR(profile,15) gender,
count(*) number
from
user_submit
GROUP BY
gender
substring_index(字符串，分隔符，计数)
SELECT substring_index(profile,",",-1) gender,COUNT(*) number
FROM user_submit
GROUP BY gender;
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