InterBase Quick Start: Part IV - Using the HAVING Clause
Go Up to InterBase Quick Start: Part IV - Grouping and Ordering Query Results
Just as a WHERE clause reduces the number of rows returned by a SELECT clause, the HAVING clause can be used to reduce the number of rows returned by a GROUP BY clause. Like the WHERE clause, a HAVING clause has a search condition. However, in a HAVING clause, the search condition typically corresponds to an aggregate function used in the SELECT clause.
Controlling your Query with GROUP BY and HAVING
- Issue the following query to list the departments that have an average budget of over $60,000 and order the result set by department.
SELECT Department, AVG(budget) FROM department
GROUP BY Department
HAVING AVG(budget) >60000
ORDER BY Department
- The result set should look like this:
