Backup and Recovery
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Write a SQL query to find employees who have been with a company for more than 5 years. The table to query has the following schema: (name, department, start_date). The query should return the (name, department, start_date) for each employee meeting the 5 year criteria.
About this solution: This solution is correct and demonstrates a good understanding of SQL.
To find the sum of all values in a table with two columns, "id" and "value", use the following query:
SELECT SUM(value) FROM table
About this solution: The candidate's solution is correct and demonstrates a complete understanding of how to find the sum of all values in a table. The candidate's approach is also optimal, as they have used the SUM function which is specifically designed to sum all values in a column.
To find the top 5 employees with the highest salaries, you can write a SQL query that orders the employees by salary in descending order and then limits the result set to the first 5 employees.
About this solution: The candidate's solution is correct and demonstrates a good understanding of SQL. The candidate has correctly used the ORDER BY and LIMIT clauses to sort the table by salary in descending order and then limit the results to the top 5 salaries.
You are tasked with creating a backup and recovery plan for a database. The database is currently running on a single server. The backup plan must be able to recover the database in the event of a server failure.
About this solution: The candidate's solution is complete and solves the problem. The approach is straightforward and should work well in most cases.
The goal is to design a backup and recovery solution that will work in both a single server and a distributed system environment. The solution needs to be able to scale up or down as the number of databases or users increases or decreases.
About this solution: The candidate's solution is incomplete. The candidate does not mention how the backup and recovery solution will work in a distributed system. The candidate also does not mention how the solution will scale up or down as the number of databases or users increases or decreases.
To find the top 3 customers with the highest average order value, you can use a SQL query. This query will take the customer data from a table and find the 3 customers with the highest average order value.
About this solution: This solution is optimal because it uses the GROUP BY and ORDER BY clauses to group the data by customer ID and then order the data by the average order value. The LIMIT clause is used to limit the results to the top 3 customers.
To find all duplicates in a table with first and last name columns, you can use a SQL query. This query will return all rows where the first and last name match.
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 HAVING clauses to group and filter the data.
Write a SQL query to find the total number of orders for each customer from a table of customer order information.
About this solution: This solution is complete and solves the problem. It uses a GROUP BY clause to group the orders by customer, and then uses the COUNT function to count the number of orders for each customer.