The SQL GROUP BY Clause
In this SQL tutorial we’ll walk you through the SQL GROUP BY clause.
In this SQL tutorial for beginners, you will learn that:
1) The SQL GROUP BY clause works only with SELECT statements.
2) The SQL GROUP BY clause is to be provided after the WHERE SQL clause.
3) The SQL GROUP BY clause should come before an ORDER BY clause.
4) The SQL GROUP BY clause can be used together with the HAVING SQL clause.
Another thing to note is that the SQL query GROUP BY is very frequently used together with SQL aggregate functions, such as COUNT(), MIN(), AVG(), or MAX().
Also note that the SQL queries containing the GROUP BY clause are aware of NULL values – rows containing NULL turn into a group of rows inside of our result set.
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