Determine which service is the most contracted by corporate owners who own offices or apartments. (Hint: This will require a two-step process, which will require to build upon the initial statement based on output to create one statement as a response). SQL Server
Nesting aggregate functions is not allowed in SQL. How do I solve this quesiton?

What is domain name system (dns)? allows dynamic ip address allocation so users do not have to have a preconfigured ip address to use the network converts ip addresses into domains, or identifying labels that use a variety of recognizable naming conventions the efficient coexistence of telephone, video, and data communication within a single network, offering convenience and flexibility not possible with separate infrastructures the integration of communication channels into a single service