Partitioning

Get id and value of row with highest value
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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.

170
Jan 31
Top 3 Most Populous Countries
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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.

154
Jan 28
Partitioning a Table by Year in SQL
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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.

147
Nov 27
Finding the Most Common Value in a Table
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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.

168
Nov 25
Find most common value in SQL table
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Given a table with two columns, this SQL query will find the most common value in the second column.

154
Nov 22
Designing a Database Schema for a Library System
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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.

120
Nov 21
Find the most common value in each column of a table with two columns.
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Given a table with two columns, find the most common value in each column using a SQL query.

153
Nov 20
Average Salary by Department
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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.

170
Nov 20