SQL Profiler is a tool that allows you to track and analyze SQL Server activities. To make a recursive function, you must first build a function that will call itself recursively. The current node and the list of nodes will be the required parameters for this function. The function must then determine whether the current node is the list's last node. If that's the case, the function will return the last node's value. If the current node is not the last node in the list, the function will be called with the current node and a list of nodes after it. It must keep track of the current node in order to return the value of the previous node. Similarly, in order to return the value of the first node, the function will need to keep track of the list of nodes.