SQL Essentials: RANK Function Explained

Overview

The RANK function is an analytic SQL function that assigns a unique rank to each row within a partition of a result set, based on the order specified in the ORDER BY clause. Rows with equal values receive the same rank, and the next rank is skipped accordingly.

In simpler terms, the RANK function helps you order data and assign a position to each row. If multiple rows have the same value, they share the same rank, and the subsequent rank is adjusted to account for these ties. This is particularly useful for scenarios like ranking sales performance, identifying top-performing products, or ordering transaction line items.