``++HAVING++`` was introduced to limit the result set after selection because ``++WHERE++`` clause conditions cannot be used on aggregated values. ``++HAVING++`` conditions that don't operate on aggregated values can safely be moved into the ``++WHERE++`` clause for increased efficiency.


== Noncompliant Code Example

[source,text]
----
SELECT p.id, p.name, count(o.id)
FROM product p
JOIN order_row o on p.id=o.product_id
GROUP BY p.id
HAVING count(o.id) > 10
  p.name like "t-shirt%"  -- Noncompliant
----


== Compliant Solution

[source,text]
----
SELECT p.id, p.name, count(o.id)
FROM product p
JOIN order_row o on p.id=o.product_id
WHERE p.name like "t-shirt%"
GROUP BY p.id
HAVING count(o.id) > 10
----