To replicate a database across multiple servers, you would need to set up a master server with the database, and then set up replication on the other servers. This would allow the other servers to have copies of the database, which would be updated whenever the master server's database is updated.
This technical problem deals with writing a SQL query to find all parents who have at least one child. The example input and output are provided in the body of the problem.
Given a database with two tables, Employees and Departments, this SQL query will find the names of all employees who work in the Sales department.
This technical problem asks the reader to write a SQL query that returns the names and total spending for customers who have made a purchase from the store in the last 30 days. The input is provided in the form of two tables, customers and orders, and the output is expected in the form of a table with two columns, name and total_spent.