How to execute that in 1 query? - php

Question

I have 2 tables customer and orders:
customers:
| custID | Name | Age |
|--------|-------|-----|
| 1 | Peter | 23 |
| 2 | Julie | 34 |
| 3 | Tom | 45 |
orders:
| custID | product | color |
|--------|---------|-------|
| 1 | shirt | blue |
| 1 | jacket | black |
| 2 | jacket | green |
| 3 | hat | grey |
| 3 | shirt | white |
I now want to get all customers and their orders, ordered as a list. So something like that:
Array
(
[0] => Array
(
[ID] => 1
[name] => Peter
[age] => 23
[orders] => Array
(
[0] => Array
(
[product] => shirt
[color] => blue
)
[1] => Array
(
[product] => jacket
[color] => black
)
)
)
[1] => Array
(
[ID] => 2
[name] => Julie
[age] => 34
[orders] => Array
(
[0] => Array
(
[product] => jacket
[color] => green
)
)
)
[2] => Array
(
[ID] => 3
[name] => Tom
[age] => 45
[orders] => Array
(
[0] => Array
(
[product] => hat
[color] => grey
)
[1] => Array
(
[product] => shirt
[color] => white
)
)
)
)
When I do:
SELECT name, age, product, color
FROM `customers`, `orders`
where `customers`.`id` = `orders`.id
group by name
I get:
| name | age | product | color |
|-------|-----|---------|-------|
| Peter | 23 | jacket | green |
| Julie | 34 | shirt | blue |
| Tom | 45 | hat | grey |
Is this even possible with only one query?

Answer 1

You could simply make the query below:
SELECT *
FROM customers
JOIN orders
USING custID
GROUP BY Name
ORDER BY custID ASC;

Answer 2

A couple of steps here...
First, you should run the following query:
SELECT
`customers`.`id`,
`customers`.`name`,
`customers`.`age`,
`orders`.`product`,
`orders`.`color`
FROM `customers`, `orders`
where `customers`.`id` = `orders`.`id`
order by `customers`.`id`
Which should give you de-normalized tabular data that looks something like this:
$array = array(
array("id" => 1, "name" => "Peter", "age" => 23, "product" => "shirt", "color" => "blue"),
array("id" => 1, "name" => "Peter", "age" => 23, "product" => "jacket", "color" => "black"),
array("id" => 2, "name" => "Julie", "age" => 34, "product" => "jacket", "color" => "green"),
array("id" => 3, "name" => "Tom", "age" => 45, "product" => "hat", "color" => "grey"),
array("id" => 3, "name" => "Tom", "age" => 45, "product" => "shirt", "color" => "white")
);
You can then transform the that data into your desired format as follows:
$transformed = array();
$i = 0;
while ($i < count($array)) {
$id = $array[$i]["id"];
$name = $array[$i]["name"];
$age = $array[$i]["age"];
$products = array();
while ($i < count($array) && $id == $array[$i]["id"]) {
array_push($products, array("product" => $array[$i]["product"], "color" => $array[$i]["color"]));
$i++;
}
array_push($transformed, array("id" => $id, "name" => $name, "age" => $age, "products" => $products));
}
http://sandbox.onlinephpfunctions.com/code/6fe856e1f71f699e84215b6f66d25589f71e255e

Answer 3

i think you should user INNER JOIN:
SELECT * FROM customers AS c INNER JOIN orders AS o ON c.custID = o.custID GROUP BY c.custID ORDER BY c.custID ASC;

Answer 4

There is no point in trying to achieve the desired outcome with single query. With the first query get the list of customers. Then perform a second query, which will load all the orders for the customers from the first query. And in a loop match orders to respective customers.
EDIT: something like this
$result = [];
$customers = $pdo->query("SELECT * FROM `customers`")->fetchAll();
foreach ($customers as $c) {
$result[$c['id']] = $c;
}
$orders = $pdo->query("SELECT * FROM `orders` WHERE `custID` IN (".implode(', ', array_keys($result).")");
foreach ($orders as $o) {
if (!isset($result[$o['custId']]['orders']))
$result[$o['custId']]['orders'] = [];
$result[$o['custId']]['orders'][] = $o;
}

Answer 5

Your sql SELECT name, age, product, color FROMcustomers,orderswherecustomers.id=orders.id group by name is fine, just add the customer id and order id also in the sql. Then, in PHP, as you iterate the result set, populate the customer info first (id, name, age) with customer id as the key and name, age as value as an array. Likewise, populate the order for that customer in the key 'orders' with the order id as key and value as an array (product, color).
Once you have the array populated, iterate over that array and keep putting things into a new array since the output you want is an array with sequential keys (0, 1, 2 etc) instead of customer id.
$initialList = array();
while($row = $result->fetch_assoc()) {
if(!array_key_exists($row['customer_id'], $initialList)) {
$initialList[$row['customer_id']] = array(
'name' => $row['name'],
'age' => $row['age'],
'orders' => array()
);
}
$initialList[$row['customer_id']]['orders'][] = array(
'product' => $row['product'],
'color' => $row['color']
);
}
$finalList = array();
foreach($initialList as $customerId => $customer) {
$customer['ID'] = $customerId;
$finalList[] = $customer;
}
//to print and check the array
print_r($finalList);

Answer 6

try this:
SELECT c.custID,c.name, c.age, group_concat(CONCAT_WS(':',o.product,o.color)SEPARATOR ',') as productos
FROM customers AS c
INNER JOIN orders AS o ON c.custID = o.custID
GROUP BY c.custID;
You just have to parse the products.
$array=array();
while($r = $res->fetch_assoc()) {
$id=$row['custID'];
$name=$row['name'];
$age=$row['age'];
$productos=$row['productos'];
$productsSeparats = explode(',',$productos);
$orders=array();
foreach ($productsSeparats as $value) {
$ar=explode(':',$value);
array_push($orders, array("product" => $ar[0], "color" => $ar[1]));
}
array_push($array, array("id" => $id, "name" => $name, "age" => $age, "orders" => $orders));
}