SQL HAVING

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What is SQL HAVING?

The SQL HAVING is a clause that enables conditions at the aggregate level. It is used instead of the WHERE clause when Aggregate Functions are used.

The SQL HAVING clause supports the same operators as the WHERE clause. Grouped results can be checked using this clause.

Why Use SQL HAVING?

The HAVING clause is used to SELECT information based aggregate information. For example, one may want to list sales representatives that have sales totaling over $10,000. This is very useful for analytical reporting.

How To Use SQL HAVING

SQL HAVING is used as follows.

SQL HAVING Syntax

SELECT <column_name1>, <column_name2> <aggregate_function>
FROM <table_name>
GROUP BY <column_name1>, <column_name2>
HAVING <having_condition>

SQL HAVING Example

The following example regions from the branch table that have total employee_count greater than 5.

Here are the contents of the table:

Table: BRANCH

branch_nbr branch_name region_nbr employee_count

108 New York 100 10

110 Boston 100 6

212 Chicago 200 5

404 San Diego 400 6

415 San Jose 400 3

branch_nbr	branch_name	region_nbr	employee_count
108	New York	100	10
110	Boston	100	6
212	Chicago	200	5
404	San Diego	400	6
415	San Jose	400	3

This SQL Statement with HAVING is executed:

SELECT region_nbr, sum(employee_count)
FROM branch
GROUP BY region_nbr
HAVING sum(employee_count) > 5
ORDER BY region_nbr

Here is the result.

region_nbr sum(employee_count)

100 16

400 9

region_nbr	sum(employee_count)
100	16
400	9

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