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[2.0.10] PHQL Join With Subquery

I heard that as of Phalcon 2.0.2, PHQL supports subqueries. I am receiving an error while joining on a subquery. Is this case not supported? I am using Phalcon 2.0.10

PHQL: SELECT invoice.* FROM \Domain\Model\Invoice invoice LEFT JOIN (SELECT payment.invoiceId FROM \Domain\Model\Payment payment GROUP BY payment.invoiceId) paymentsum ON paymentsum.invoiceId = invoice.id

Error: Syntax error, unexpected token SELECT, near to ' payment.invoiceId FROM \\Domain\\Model\\Payment payment GROUP BY payment.invoiceId paymentsum ON paymentsum.invoiceId = invoice.id', when parsing: SELECT invoice.* FROM \\Domain\\Model\\Invoice invoice LEFT JOIN SELECT payment.invoiceId FROM \\Domain\\Model\\Payment payment GROUP BY payment.invoiceId paymentsum ON paymentsum.invoiceId = invoice.id (196)



107.4k
Accepted
answer
edited Jul '16

Yes, it's supporting subqueries but not in this case. Only in select(that we can subselect something). Soory for that. But this join looks kind of weird, is something like this even working in raw sql ?



1.2k
edited Jul '16

Yes. My example above could be rewritten without the SELECT in the JOIN. However, I am working on something that requires gathering a separate SUM from two separate tables.

For exmple, I have an invoice table, payments table and invoiceitem table. I would like to get the invoices along with the sum of the payments and the sum of the invoiceitem's prices.

The accepted answer here helped me come up with the query.

Since it's not supported in PHQL, my solution is just executing this as Raw SQL.

Imho i think it can be done justi in select, not sure why you need it in join.



1.2k
edited Jul '16

I thought so too at first, but was not able to come up with anything. Here is a more accurate example of what I am trying to accomplish. Any suggestions on rewriting the query are welcome.

<?php
$db = new PDO(
    sprintf('mysql:host=%s;dbname=%s', '127.0.0.1', 'test'),
    'root',
    ''
);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$sql = '
DROP TABLE IF EXISTS `invoices`;
CREATE TABLE `invoices` (
  `id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `name` VARCHAR(45) NULL,
  PRIMARY KEY (`id`)
);
INSERT INTO invoices (name) VALUES ("Invoice #1"), ("Invoice #2");
';
$db->exec($sql);

$sql = '
DROP TABLE IF EXISTS `items`;
CREATE TABLE `items` (
  `id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `invoiceId` INT NOT NULL,
  `price` DOUBLE NOT NULL DEFAULT 0,
  PRIMARY KEY (`id`)
);
INSERT INTO items (invoiceId, price) VALUES (1, 10), (1, 15), (1, 15), (2, 5), (2, 10)
';
$db->exec($sql);

$sql = '
DROP TABLE IF EXISTS `payments`;
CREATE TABLE `payments` (
  `id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `invoiceId` INT NOT NULL,
  `amount` DOUBLE NOT NULL DEFAULT 0,
  PRIMARY KEY (`id`)
);
INSERT INTO payments (invoiceId, amount) VALUES (1, 5), (1, 10), (2, 5)
';
$db->exec($sql);

$sql = '
SELECT invoices.name, paymentsum.payments, itemsum.subtotal
FROM invoices
LEFT JOIN (
   SELECT items.invoiceId, SUM(items.price) AS subtotal FROM items GROUP BY items.invoiceId
) itemsum ON itemsum.invoiceId = invoices.id
LEFT JOIN (
   SELECT payments.invoiceId, SUM(payments.amount) AS payments FROM payments GROUP BY payments.invoiceId
) paymentsum ON paymentsum.invoiceId = invoices.id
';

$records = $db->query($sql)->fetchAll();

foreach ($records as $record) {
    echo $record['name'] . ' - Item Total: ' . $record['subtotal'] . ' | Payments: ' . $record['payments'] . "\r\n";
}

Output:

Invoice #1 - Item Total: 40 | Payments: 15

Invoice #2 - Item Total: 15 | Payments: 5

You can do raw sql in phalcon.