比如统计出
sex major title answer baifenbi
男 机电 1 a 50%
男 机电 2 b 20%
像这样的数据该如何去写sql语句
SELECT
a.sex, a.major, a.title, a.answer,a.answercnt/b.titlecnt
FROM (SELECT sex, major, title, answer,SUM(1) AS answercnt FROM Table GROUP BY sex, major, title, answer) a
JOIN (SELECT sex, major, title,SUM(1) AS titlecnt FROM Table GROUP BY sex, major, title) b
ON a.sex = b.sex
AND a.major = b.major
AND a.title = b.title
版权声明:本文内容由阿里云实名注册用户自发贡献,版权归原作者所有,阿里云开发者社区不拥有其著作权,亦不承担相应法律责任。具体规则请查看《阿里云开发者社区用户服务协议》和《阿里云开发者社区知识产权保护指引》。如果您发现本社区中有涉嫌抄袭的内容,填写侵权投诉表单进行举报,一经查实,本社区将立刻删除涉嫌侵权内容。