SQL Window Functions Series: NTILE()

Continuing our journey through SQL’s handy window functions, we now tackle the NTILE() function. After exploring LAG(), LEAD(), RANK(), and DENSE_RANK(), NTILE() stands out for splitting data into clear, ordered groups. It’s perfect for grading performance, figuring out percentiles, and organizing data.

Introduction to NTILE()

NTILE() is a window function that allows you to divide an ordered result set into a specified number of approximately equal parts. It’s an excellent tool for ranking items into buckets or quantiles, such as quartiles, quintiles, deciles, or any other ’tile’ you need.

Imagine you have a list of employees with their sales figures