Need help in mysql RIGHT join - php

Question

here is mytable structure?
table:category
id name
1 x
2 y
table:subproduct
id cat_id name myval
1 1 xyz test
2 1 abc test2
So basically i want to select all values from subproduct for each id of category table and show it in array in php?
here is my PHP code
$sqlnew = "SELECT c.cat_id,c.cat_title,s.sub_id,s.sub_title,s.store_cashback FROM category c JOIN subproduct s ON c.cat_id = s.pid";
$pdo = getDB();
$stmtnew = $pdo->query($sqlnew);
$resultnew = $stmtnew->fetchAll();
var_dump($resultnew);
I am using PHP PDO.

Answer 1

If you want to get all items with a particular category ID, you should do something like this:
$statement = $pdo->prepare("SELECT * FROM subproduct INNER JOIN category " .
"ON category.id = subproduct.cat_id WHERE category.id = :id");
$statement->bindValue(":id", $category_id, PDO::PARAM_INT);
$statement->execute();
$data = $statement->fetchAll();
You could use this to individually fetch each category ID and build an array like this:
$statement = $pdo->query("SELECT id FROM category;");
$ids = $statement->fetchAll(PDO::FETCH_COLUMN, 0);
$data = array();
foreach($ids as $id)
{
$statement = $pdo->prepare("SELECT * FROM subproduct INNER JOIN category " .
"ON category.id = subproduct.cat_id WHERE category.id = :id");
$statement->bindValue(":id", $id, PDO::PARAM_INT);
$statement->execute();
$data[$id] = $statement->fetchAll();
}
print_r($data);
I am not crazy about this because it looks inefficient and I don't like looping through queries. You could also request all the data at once and then rearrange it:
$statement = $pdo->query("SELECT * FROM subproduct");
$data = array();
while($subproduct = $statement->fetch(PDO::FETCH_ASSOC))
{
$id = $subproduct['cat_id'];
if (!isset($data[$id])
$data[$id] = array();
array_push($data[$id], $subproduct);
}
print_r($data);
I don't really like this either because using PHP to sort MYSQL data feels wrong since that is MYSQL's job. I could have requested MYSQL sort the data, but then the data would still need to be broken up into a multi-dimensional array, so I am not sure that helps.