In the fast-paced world of technology and business, there’s a certain allure to being the go-to person. The one everyone turns to when a critical system goes down, or a complex problem needs solving. You’re the expert, the guru, the Subject Matter Expert (SME). And that feels good. But there’s a subtle, yet dangerous, line you can cross, transforming yourself from an invaluable asset into a Single Point of Failure (SPF).

COUNT() is a function that returns the number of items found in a group. Syntax-wise, it is very easy, but it can be tricky to get the best performance out of it.