Backup and Recovery
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The number of customers who have placed an order in the last 30 days can be found by querying the orders table and counting the number of customer_id entries where the order_date is within the last 30 days.
About this solution: The candidate's solution is correct and demonstrates a good understanding of how to use the DATE_SUB function to get the date 30 days ago. The candidate's solution is also efficient because it uses the WHERE clause to filter the results.
The number of customers who have placed an order in the last 30 days can be found by querying the orders table and counting the number of customer_id entries where the order_date is within the last 30 days.
About this solution: The candidate's solution is correct and demonstrates a good understanding of how to use the DATE_SUB function to get the date 30 days ago. The candidate's solution is also efficient because it uses the WHERE clause to filter the results.
Write a SQL query to find the most recent backup of each database on a server.
About this solution: The candidate's solution does not demonstrate a level of completeness and does not solve the problem. The general approach is not clear.