Specifies conditions for groups of rows (for example, display only the departments that have salaries totaling more than $200,000). This clause is valid only if you have already defined a Group By clause.
Syntax
HAVING expr1 rel_operator expr2
where:
expr1
is a column name, a constant value, or an expression. An expression does not have to match a column expression in the Select clause.
expr2
is a column name, a constant value, or an expression. An expression does not have to match a column expression in the Select clause.
rel_operator
is the relational operator that links the two expressions.
Example
This example returns only the departments that have salaries totaling more than $200,000:
SELECT dept_id, sum(salary) FROM emp
GROUP BY dept_id HAVING sum(salary) > 200000
