The Trips table holds all taxi trips. Each trip has a unique Id, while Client_Id and Driver_Id are both foreign keys to the Users_Id at the Users table.
Rising Temperature
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分类于
LeetCode
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SQL problems
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MySQL
Given a Weather table, write a SQL query to find all dates’ Ids with higher temperature compared to its previous (yesterday’s) dates.
Delete Duplicate Emails
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分类于
LeetCode
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SQL problems
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MySQL
Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id.
Department Top Three Salaries
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分类于
LeetCode
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SQL problems
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MySQL
The Employee table holds all employees. Every employee has an Id, and there is also a column for the department Id.
Department Highest Salary
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分类于
LeetCode
，
SQL problems
，
MySQL
The Employee table holds all employees. Every employee has an Id, a salary, and there is also a column for the department Id.