LeetCode 580. Count Student Number in Departments
A university uses 2 data tables, student and department, to store data about its students and the departments associated with each major.
Write a query to print the respective department name and ...
LeetCode 578. Get Highest Answer Rate Question
Get the highest answer rate question from a table survey_log with these columns: uid, action, question_id, answer_id, q_num, timestamp.
uid means user id; action has these kind of values: "show", "answer", "skip" ...