Aggregate function

Aggregate Function, also known as Group Function, is a special type of built-in function in SQL which allows users to perform calculations on groups of data. It can execute various calculations such as Sum, Average, Count, Min, Max, and many more. Aggregate functions are commonly used in database management systems (DBMS) and data analysis processes.

Aggregate functions allow users to quickly get the desired results from data in a single command, rather than having to perform multiple operations on the data set to calculate the same results. They are often used to quickly summarize a group of values into a single value. For example, an aggregate function could be used to calculate the total number of orders or the average sales amount for a particular product.

The syntax for an aggregate function includes the keywords SUM, GROUP BY, AVG, COUNT, MAX, or MIN. It is then followed by the column(s) for which the aggregate calculation should be performed. Finally, the GROUP BY clause is used to sort the data into individual groups that the aggregate calculation should be performed on.

Aggregate functions are an indispensable tool in data analysis that reduces the complexity of writing queries. They can also speed up query processing time when used in complex statements, and can even be used to create elaborate reports for management.