How can PHP developers efficiently link data from multiple columns in a database table to achieve a desired output?

When linking data from multiple columns in a database table, PHP developers can use SQL queries with joins to fetch the necessary data. By specifying the columns to link on in the join condition, developers can retrieve related data from different tables and achieve the desired output efficiently. 

<?php
// Establish a database connection
$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 to link data from multiple columns
$sql = "SELECT table1.column1, table2.column2
        FROM table1
        INNER JOIN table2 ON table1.common_column = table2.common_column";

$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // Output data of each row
    while($row = $result->fetch_assoc()) {
        echo "Column1: " . $row["column1"]. " - Column2: " . $row["column2"]. "<br>";
    }
} else {
    echo "0 results";
}

$conn->close();
?>

Keywords

PHP database table data linking multiple columns desired output

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