Doctrine_manual-1-2-en

Chapter 9: DQL (Doctrine Query Language) 148
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// ...
$q = Doctrine_Query::create()
->select('SUM(a.amount)')
->from('Account a');
echo $q->getSqlQuery();
The above call to getSql() would output the following SQL query:
SELECT
SUM(a.amount) AS a__0
FROM account a
Using an aggregate function in a statement containing no GROUP BY clause, results in
grouping on all rows. In the example below we fetch all users and the number of
phonenumbers they have.
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// test.php
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// ...
$q = Doctrine_Query::create()
->select('u.username')
->addSelect('COUNT(p.id) as num_phonenumbers')
->from('User u')
->leftJoin('u.Phonenumbers p')
->groupBy('u.id');
echo $q->getSqlQuery();
The above call to getSql() would output the following SQL query:
SELECT
u.id AS u__id,
u.username AS u__username,
COUNT(p.id) AS p__0
FROM user u
LEFT JOIN phonenumber p ON u.id = p.user_id
GROUP BY u.id
The HAVING clause can be used for narrowing the results using aggregate values. In the
following example we fetch all users which have at least 2 phonenumbers
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// test.php
// ...
$q = Doctrine_Query::create()
->select('u.username')
->addSelect('COUNT(p.id) as num_phonenumbers')
->from('User u')
->leftJoin('u.Phonenumbers p')
->groupBy('u.id')
->having('num_phonenumbers >= 2');
echo $q->getSqlQuery();
The above call to getSql() would output the following SQL query:
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