Learn what aggregate functions are, how to use them in SQL queries, and why they are useful for BI. Find examples of common scenarios and calculations.

In SQL, aggregate functions are used to calculate a set of values and return a single value. When using aggregate functions in SQL, it is crucial to understand column references. A column reference is ...

Learn how to easily fix the your query does not include the specified expression as part of an aggregate function SQL error.

Initialize the accumulator variable(s) based on the type of aggregate functioN Retrieve the data from the table or source based on the query's filtering conditions, if any. Iterate over the retrieved ...

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.