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Machine Learning / Data Science
DifficultyMedium
The k-nearest neighbors algorithm is a supervised learning algorithm that can be used for both classification and regression. The algorithm works by finding the k nearest neighbors to a given data point, and then using those neighbors to predict the class or value of the data point.
About this solution: The candidate's solution is complete and solves the problem. The approach is generally sound, although there may be more efficient ways to implement the algorithm.
This problem deals with finding a target value in a sorted array of integers. The function should return the index of the target value if it is found in the array, or -1 if it is not found.
About this solution: This solution is optimal because it is O(n) time complexity. However, it only works if the array is sorted. If the array is not sorted, this solution will not work.
This technical problem involves writing a SQL query that returns the total revenue for each customer. The table schema is provided, and an example input and output are also given.
About this solution: The solution is optimal because it uses the GROUP BY clause to group the rows by customer_id and then uses the SUM function to sum the revenue for each customer.
Write a SQL query that returns the total quantity of each product ordered by each customer.
About this solution: This solution is complete and solves the problem. The approach is straightforward and easy to follow.
This question asks for the 5th highest salary from the "Employees" table. The example input is a table with id, name, and salary columns, and the example output is a table with a salary column.
About this solution: The candidate's solution correctly finds the 5th highest salary from the "Employees" table. The solution uses the correct SQL syntax and demonstrates a good understanding of the problem.
This question asks for the 5th highest salary from the "Employees" table. The example input is a table with id, name, and salary columns, and the example output is a table with a salary column.
About this solution: The candidate's solution correctly finds the 5th highest salary from the "Employees" table. The solution uses the correct SQL syntax and demonstrates a good understanding of the problem.
The table has two columns, id and data. The query should return the data in ascending order of id.
About this solution: The candidate's solution correctly returns the data in the table in ascending order of id. The solution is complete and solves the problem. The approach is straightforward and easy to understand.
This problem asks for a SQL query to find all users in a table who have a valid email address.
About this solution: This solution is incomplete because it does not account for email addresses that may have more than one '@' character. A more complete solution would use a regular expression to match email addresses.