What are some recommended resources for learning about SQL UNION in PHP?

When working with SQL UNION in PHP, it is important to understand how to combine the results of multiple SELECT statements. One recommended resource for learning about SQL UNION in PHP is the official PHP documentation, which provides detailed explanations and examples. Additionally, online tutorials and forums like Stack Overflow can also be helpful for gaining insights and troubleshooting any issues. 

<?php
// Establish a connection to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// SQL query using UNION
$sql = "(SELECT column1 FROM table1) UNION (SELECT column2 FROM table2)";

// Execute the query
$result = $conn->query($sql);

// Output the results
if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "Column: " . $row["column1"]. "<br>";
    }
} else {
    echo "0 results";
}

// Close the connection
$conn->close();
?>

Keywords

SQL UNION PHP resources learning recommended

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