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create table reg (
balance int,
card varchar(16),
code varchar(16)
);
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<?php
$stmt = $mysqli->prepare("UPDATE req
SET balance = balance - ?
WHERE card =? AND code = ? ;");
$stmt->bind_param("sss", $cost, $card, $code);
// set parameters and execute
$cost = $_GET['cost'];
$card = $_POST['card'];
$code = $_POST['code'];
$stmt->execute();
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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