How can PHP developers efficiently check for duplicate entries in a database without relying on additional queries?

When checking for duplicate entries in a database without relying on additional queries, PHP developers can utilize the `ON DUPLICATE KEY UPDATE` feature in MySQL. By specifying unique keys in the database table and using `INSERT INTO ... ON DUPLICATE KEY UPDATE`, developers can efficiently handle duplicate entries without the need for separate queries. 

// Assuming $conn is the database connection
$name = "John Doe";
$email = "johndoe@example.com";

$sql = "INSERT INTO users (name, email) VALUES ('$name', '$email') 
        ON DUPLICATE KEY UPDATE name = '$name', email = '$email'";

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

if ($result) {
    echo "Entry added or updated successfully";
} else {
    echo "Error: " . $conn->error;
}

Keywords

PHP database duplicate entries efficiency query optimization

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