Window functions in SQL Server are a powerful tool that allow you to perform complex calculations and analysis on rows within a specific window or partition of data. These functions enable you to compare rows, calculate running totals, ranks, and aggregates without altering the original data set. By using window functions, you can gain deeper insights into your data and make more informed decisions. This comprehensive guide will cover the different types of window functions available in SQL Server, how to use them effectively, and best practices for incorporating them into your queries.
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