Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
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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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RDBMS versions: MySQL 8.0, MySQL 8.0 Sakila (ReadOnly), MySQL 9.3.0, MariaDB 11.4, MariaDB 11.8, MariaDB 11.8 OpenFlights (ReadOnly), MariaDB 10, MariaDB 10 Sakila (ReadOnly), SQLite 3, SQLite 3 Preloaded, PostgreSQL 10 Bookings (ReadOnly), PostgreSQL 13, PostgreSQL 14, PostgreSQL 15, PostgreSQL 16, PostgreSQL 17 + PostGIS, PostgreSQL 17 + PostGIS WorkShop (ReadOnly), MS SQL Server 2017, MS SQL Server 2019, MS SQL Server 2022, MS SQL Server 2022 AdventureWorks (ReadOnly), Firebird 4.0, Firebird 4.0 (Employee), Firebird 5.0, RedDatabase 5.0, Oracle Database 19c (HR), Oracle Database 21c, Oracle Database 23c Free, SOQOL, ClickHouse