统计每种性别的人数

device_id	profile	blog_url
2138	180cm,75kg,27,male	http:/url/bigboy777
3214	165cm,45kg,26,female	http:/url/kittycc
6543	178cm,65kg,25,male	http:/url/tiger
4321	171cm,55kg,23,female	http:/url/uhksd
2131	168cm,45kg,22,female	http:/urlsydney

根据示例，你的查询应返回以下结果：

gender	number
male	2
female	3

示例1

输入:

drop table if exists user_submit;
CREATE TABLE `user_submit` (
`id` int NOT NULL,
`device_id` int NOT NULL,
`profile` varchar(100) NOT NULL,
`blog_url` varchar(100) NOT NULL
);
INSERT INTO user_submit VALUES(1,2138,'180cm,75kg,27,male','http:/url/bisdgboy777');
INSERT INTO user_submit VALUES(1,3214,'165cm,45kg,26,female','http:/url/dkittycc');
INSERT INTO user_submit VALUES(1,6543,'178cm,65kg,25,male','http:/url/tigaer');
INSERT INTO user_submit VALUES(1,4321,'171cm,55kg,23,female','http:/url/uhsksd');
INSERT INTO user_submit VALUES(1,2131,'168cm,45kg,22,female','http:/url/sysdney');

输出:

male|2
female|3

原站题解

上次编辑到这里，代码来自缓存点击恢复默认模板

Mysql 解法, 执行用时: 36ms, 内存消耗: 6380KB, 提交时间: 2021-12-02

SELECT substring_index(profile, ',', -1) as gender,COUNT(*) AS number FROM user_submit group by gender;

Mysql 解法, 执行用时: 36ms, 内存消耗: 6388KB, 提交时间: 2022-02-09


select substring_index(profile,',',-1) as gender,count(device_id)
from user_submit
group by gender

Mysql 解法, 执行用时: 36ms, 内存消耗: 6388KB, 提交时间: 2021-12-18

SELECT IF(u.profile LIKE '%female','female','male'),COUNT(1)
FROM user_submit u
GROUP BY IF(u.profile LIKE '%female','female','male');

Mysql 解法, 执行用时: 36ms, 内存消耗: 6396KB, 提交时间: 2021-12-03

select SUBSTRING_INDEX(profile,",",-1) as gender,count(device_id) from user_submit
group by gender

Mysql 解法, 执行用时: 36ms, 内存消耗: 6400KB, 提交时间: 2022-01-25

select SUBSTRING_INDEX(profile,',',-1) as gender, count(device_id)as number
FROM user_submit group by gender

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