How important is it for PHP developers to have a solid understanding of SQL fundamentals?

It is crucial for PHP developers to have a solid understanding of SQL fundamentals because PHP often interacts with databases to retrieve or store data. Without a good grasp of SQL, developers may struggle to write efficient and secure database queries, leading to performance issues or vulnerabilities in their applications. 

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

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

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

// Example SQL query to retrieve data from a table
$sql = "SELECT id, name, email FROM users";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // Output data of each row
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Name: " . $row["name"]. " - Email: " . $row["email"]. "<br>";
    }
} else {
    echo "0 results";
}

$conn->close();
?>

Keywords

PHP SQL fundamentals database management data manipulation query optimization

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