SELECT (CASE WHEN CHAR_LENGTH(profile)=18 THEN 'male'
ELSE 'female' END) AS gender,COUNT(*) number
FROM user_submit
GROUP BY gender;#这个方法不是很保险,前提前面字符个数都相等
SELECT (CASE WHEN CHAR_LENGTH(profile)=18 THEN 'male'
ELSE 'female' END) AS gender,COUNT(*) number
FROM user_submit
GROUP BY gender;#这个方法不是很保险,前提前面字符个数都相等