SQL Window Functions Series: LAG() and LEAD()

Dive deep into the powerful SQL window functions, LAG() and LEAD(). Explore their intricacies, discover real-world examples, and avoid common pitfalls.

An Incomplete Window Definition

Further Defining the Window Clause

Choosing Rows or Range

An Intro to SQL Window Functions

Learn about some window function basics in T-SQL

Getting top ranked employee detail for each department

Using OVER clause with ROW_NUMBER() function to get top ranked employee detail as per each department.

Understanding the OVER Clause in SQL Server

Having a solid knowledge of the window functions if vital to high performance T-SQL Code. The key to these functions is how the OVER clause is used. This article will dive into how to use the OVER clause.