方法二:连接查询筛选出有效订单记录集合 https://leetcode-cn.com/problems/trips-and-users/solution/san-chong-jie-fa-cong-nan-dao-yi-zong-you-gua-he-n/ 计算订单取消率还可以用avg(Status!='completed'): https://leetcode-cn.com/problem
613.Shortest Distance in a Line (easy) 思路:table内交生成所有可能的点对(应避免重复以提高效率), 然后计算最小距离。 selectmin(ABS(p1.x-p2.x))asshortestfrompointp1joinpointp2onp1.x<p2.x 578.Get Highest Answer Rate Question (medium) 思路: 对于每一个question_id分组,计算出它的Answer rate。
select question_id survey_log from survey_log group by question_id order by sum(if(action="answer",1,0))/sum(if(action="show",1,0)) desc limit 1 作者:baolibin 链接:https://leetcode-cn.com/problems/get-highest-answer-rate-question/solution/mysqlti-jie-by-baolibin-33/ 网友2 # Writ...
1 SELECT question_id AS survey_log 2 FROM 3 (SELECT 4 question_id, 5 SUM(IF(action='answer',1,0)) as answer_num, 6 SUM(IF(action='show',1,0))as show_num 7 -- SUM(case when action="answer" THEN 1 ELSE 0 END) AS num_answer, 8 -- SUM(case when action="show" THEN 1 ...
Structured Query Language (SQL) is the most commonly used programming language for querying and managing data in relational databases. The solution is for the corresponding LeetCode SQL question. - Annahcj/SQL-MySQL-Solutions
Here’s also the code output. 2. Count Student Number in Departments The question from LeetCode asks you the following. “Write an SQL query to report the respective department name and number of students majoring in each department for all departments in theDepartmenttable (even ones with no...
qd.difficult_level, COUNT(qpd.question_id) / COUNT(DISTINCT qpd.device_id) FROM question_practice_detail qpd left JOIN user_profile up on up.device_id = qpd.device_id left JOIN question_detail qd on qpd.question_id = qd.question_id WHERE up.university = '山东大学' GROUP BY qd.dif...
Explanation:The CASE statement is used to categorize employees based on their salary. The result categorizes them as “High”, “Medium”, or “Low”. 19. Find Duplicate Records Question: Write a query to find duplicate email addresses from the users table. Assume the users table has a colu...
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Question 1:Consecutive Numbers Source: Leetcode Write a SQL query to find all numbers that appear at least three times consecutively. For example, given the above Logs table, 1 is the only number that appears consecutively for at least three times. ...