Add non existings columns to mysql query result - php

Question

I have a PHP variable $members and it looks like this
$members = [
[
"name" => "John",
"age" => 23
],
[
"name" => "Sasha",
"age" => 24
],
[
"name" => "Asmita",
"age" => 23
]
];
Now my application stores rates based on the age of people so there is a rates table with the following structure
id
age
price
1
23
200
2
24
230
3
25
250
So, I am looping through all members and get this final query
SELECT * FROM rates WHERE age =23 OR age=24 OR age = 23
It returns me the following result
id
age
price
1
23
200
3
24
230
I want to know if there is some way I can add the member to the result set so it returns results for all 3 members like this using MYSQL itself
id
member
age
price
1
John
23
200
2
Sasha
24
230
1
Asmita
23
200

Answer 1

SQL cannot read your PHP variable. It can only read data from tables in the database, or literal values in the query. So if your data is only in the PHP variable $members (i.e. not stored in the database), this will get tricky.
The easiest solution is to query your rates table into another PHP variable, and then merge them. You can limit the result to the age values in your input data.
<?php
# form input from $_POST
$members = [
[
"name" => "John",
"age" => 23
],
[
"name" => "Sasha",
"age" => 24
],
[
"name" => "Asmita",
"age" => 23
]
];
# make list of ages appearing in the input
$ages = array_map(function($m) { return($m['age']); }, $members);
# list of '?' placeholders, equal in length to the number of ages
$placeholders = implode(',', array_fill(1, count($ages), '?'));
# connect to database
$pdo = new PDO('mysql:host=127.0.0.1;dbname=test', 'root', '');
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
# fetch the rates for all specified ages
$stmt = $pdo->prepare("SELECT age, price from rates WHERE age IN ($placeholders)");
$stmt->execute($ages);
$ratesResult = $stmt->fetchAll();
# transform the result into an associative array, mapping age to price
$rates = [];
foreach ($ratesResult as $r) {
$rates[$r['age']] = $r['price'];
}
# merge the rates into the original array of input data
foreach ($members as &$m) {
$m['price'] = $rates[$m['age']];
}
print_r($members);
Output:
Array
(
[0] => Array
(
[name] => John
[age] => 23
[price] => 200.00
)
[1] => Array
(
[name] => Sasha
[age] => 24
[price] => 230.00
)
[2] => Array
(
[name] => Asmita
[age] => 23
[price] => 200.00
)
)

Answer 2

This should do what you want;
$members = [
[
"name" => "John",
"age" => 23
],
[
"name" => "Sasha",
"age" => 24
],
[
"name" => "Asmita",
"age" => 23
]
];
$ages = collect($members)->pluck('age')->unique();
$rates = Rate::whereIn('age',$ages)->get();
$merged = collect($members)->map(function($member) use($rates) {
$member['price'] = $rates->where('age', $member['age'])->first()->price;
return $member;
});
Gets the unique ages, then queries the database for the rates, then maps over the input array, adding in the price to each member