SQL tutorial for using Having with Examples

The HAVING statment  is added to SQL because the WHERE keyword could not be used with aggregate functions ( such as count, max …)

[info] Advanced SQL SELECT Tutorial using Aggegrate Functions by Examples [/info]

The syntax for using HAVING is as below:
 

SELECT column_name, aggregate_function(column_name)
FROM table_name
WHERE column_name operator value
GROUP BY column_name
HAVING aggregate_function(column_name) operator value; 

Example for Database Structure

In order to demonstrate the usage of HAVING within SELECT statement, we will be using the following database during the course of this tutorial . The database is for an ecommerce store with 5 tables as :
Countries, Orders, Clients, Products, Prodcat

Questions

1 Find the customers who have over 16 orders ?

2 Find the first five countries with the largest number of orders WITH a total revenue over 11200?