## Partitioning

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Databases / SQL DifficultyHard SQL
To find the id and value of the row with the highest value in a table with two columns, id and value, write a query that will return the id and the value of the row with the highest value.
About this solution: The solution above is optimal because it uses the ORDER BY and LIMIT clauses to sort the table by value in descending order and then return the first row.
Jan 31
Databases / SQL DifficultyHard SQL
The technical problem is how to write a SQL query that returns the top 3 most populous countries. The example output is China, India, United States.
About this solution: The solution is optimal because it uses the ORDER BY and LIMIT clauses to sort the table by population in descending order and then limit the results to the top 3.
Jan 28
Databases / SQL DifficultyHard SQL
Given a table of data, write a SQL query to partition the data by year. The table should have three columns: id, value, and year. The query should return the id, value, and year for each row in the table.
About this solution: The solution above is correct and demonstrates a level of completeness. It solves the problem by partitioning the data by year. The approach is efficient and straightforward.
Nov 27
Databases / SQL DifficultyHard SQL
To find the most common value in a table with two columns, you can use a SQL query. For example, given the table above, the query would return 3 as the most common value in the second column.
About this solution: The solution above is optimal because it uses the GROUP BY and ORDER BY clauses to group the values and order them by count. The LIMIT clause is used to limit the result to one row.
Nov 25
Databases / SQL DifficultyHard SQL
Given a table with two columns, this SQL query will find the most common value in the second column.
About this solution: The candidate's solution is complete and solves the problem. The approach is straightforward and uses a single query to find the most common value in the second column.
Nov 22
Databases / SQL DifficultyHard SQL
Design a database schema for a library system that keeps track of books, patrons, and checkouts. The system should allow patrons to check out multiple books at a time, and should keep track of when books are due back.
About this solution: This solution is a good start, but it is missing a few key details. For example, it does not specify what information is stored in each table. In addition, the solution does not address how the system will keep track of which books are available and which are checked out.
Nov 21
Databases / SQL DifficultyHard SQL
Given a table with two columns, find the most common value in each column using a SQL query.
About this solution: The candidate's solution is correct and demonstrates a good understanding of SQL. The solution is also efficient, using the GROUP BY and ORDER BY clauses to group and order the rows by the values in each column, and then using the LIMIT clause to return only the first row.
Nov 20
Databases / SQL DifficultyHard SQL
This technical problem deals with writing a query that returns the average salary of employees in each department. The given table includes information on the department, employee, and salary. The expected output is a table that lists the department and the average salary for that department.
About this solution: This solution is complete and solves the problem. The approach is straightforward and easy to follow.
Nov 20