我就不信我找不到实习
我就不信我找不到实习
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我就不信我找不到实习的博客
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题解 | #查看不同年龄段的用户明细#
SELECT device_id,gender, (CASE WHEN age < 20 THEN '20岁以下' WHEN age BETWEEN 20 and 24 THEN '20-24岁' WHEN age>=25 THEN '25岁及以上' ELSE '其他' END) AS ...
Mysql
2022-01-14
0
203
题解 | #浙江大学用户题目回答情况#
SELECT university ,COUNT(q.question_id)/COUNT(DISTINCT u.device_id)FROM user_profile AS u JOIN question_practice_detail AS q ON u.device_id=q.device_i...
Mysql
2022-01-13
0
229
题解 | #浙江大学用户题目回答情况#
select device_id,question_id,result from question_practice_detail WHERE device_id IN (SELECT device_id FROM user_profile where university = '浙江大学')
Mysql
2022-01-13
0
212