Aggregate functions and the GROUP BY clause

In this lesson, we explain the basics of SQL, to be specific, aggregate functions and the GROUP BY clause. In this we get to know on how we can carry out several manipulations out on the large data through the use of functions such as `SUM`, `COUNT`, `AVG`, `MAX` and `MIN`. This is how these functions help in summarizing information for example total sale or even the average size of the orders among others.

Next, there is the GROUP BY clause, which is also highly significant when grouping, sorting and aggregating data by a number of fields. Understand the method to sort the records by one or many options as a groundwork for the grouping and obtaining of analysis outcomes. The following usually keeps the record handy such as when putting into practice the group by clause simultaneously with a selected aggregate function, it makes it easier to get improved results from large data sets; therefore the convenience of making conclusions and reports. Whether one is new to the language or experienced and wishes to improve in SQL, this tutorial and enhance their usage of the language for query.