SQL Window functions are an advanced type of function in SQL. In this post, you will learn about what SQL window functions are and how they can be used or work.

You’ll gain experience with advanced functions like subqueries, string functions, and if-else logic with case, and you’ll learn to work with views and functions.

This article explores the internals of Oracle9i indexing; reviews the standard b-tree index, index-only tables, and how these indexes may increase the speed of Oracle SQL queries.