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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
CREATE TABLE `cart` (
`id` int primary key auto_increment,
`user` int
);
INSERT INTO `cart` (`user`) VALUES (1), (2), (3);
CREATE TABLE `button` (
`id` int primary key auto_increment
);
INSERT INTO `button` (`id`) VALUES (4);
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<?php
$user = 1;
$result = mysqli_query($mysqli, "SELECT * FROM `cart`
LEFT JOIN `button` ON cart.id = button.id
UNION ALL
SELECT * FROM `cart`
RIGHT JOIN `button` ON cart.id = button.id
WHERE `user`='" . $user . "'");
while($row = mysqli_fetch_assoc($result)) {
print_r($row);
}
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