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Solutions to Problems For SQL on Leetcode, Hackerrank & DataLemur

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Practice SQL Scripts From Interview Prep Websites

These are scripts that answer questions from leetcode, hackerank and sqlzoo. Links to questions and my answers are below!

LeetCode

Question	Answer
Employees earn more than their managers	Solution
Second highest salaries	Solution
Customers who never order	Solution
Duplicate Emails	Solution
Rising Temperatures	Solution
Department Top Three Salaries	Solution
N-th Highest Salary	Solution
Department Highest Salary	Solution
Rank Scores	Solution
Not Boring Movies	Solution
Exchange Seats	Solution
Consecutive Numbers	Solution
Human Traffice Of Stadium	Solution
Trips and Users	Solution

Hacker Rank

Question	Answer
Japanese Cities	Solution
Earnings of employees	Solution
Weather Observation Station 8	Soluton
Weather Observation Station 9	Soluton
More Than 75 Marks	Solution
The Pads	Solution
Binary Search Tree 1	Solution

SQLZoo

Question	Answer
Richer Than UK	Solution
Bigger Than Every Country In Europe	Solution
Neighbours of Argentina and Australia	Solution
Teams that have coach Fernando Santos	Solution
Busy years for John Travolta	Solution

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Solutions to Problems For SQL on Leetcode, Hackerrank & DataLemur