This tutorial is about aggregate functions such as COUNT, SUM and AVG. An aggregate function takes many values and delivers just one value. For example the function SUM would aggregate the values 2, 4 ...

The SUM() function in SQL returns the total sum of a numeric column. It's commonly used to calculate totals in datasets like sales, quantities, or prices.

Sum ( ) , it is a function which return the aggregate sum of any expression , like salary of multiple employee , sum of population in any particular area etc . In above result you can see , it return ...