When working with reports and analytics, one common problem keeps showing up: missing days. Your database only stores rows when something happens. It can be sales, logins, tickets, events. But charts ...

Some computing algorithms are more naturally implemented using recursion than iteration. This article explains how to use recursion to calculate Monthly Recurring Revenue (MRR) for annual ...

Problem: Starting from the HR department head (dept_id = 1, manager_id is NULL), list all employees in that reporting chain (head + all direct/indirect reports).