How can one improve the efficiency of SQL queries in PHP?

To improve the efficiency of SQL queries in PHP, one can utilize prepared statements instead of directly inserting variables into the query. Prepared statements help prevent SQL injection attacks and can also improve performance by allowing the database to reuse query execution plans. 

// Using prepared statements to improve efficiency of SQL queries
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username");
$stmt->bindParam(':username', $username, PDO::PARAM_STR);
$stmt->execute();
$results = $stmt->fetchAll();

Keywords

SQL optimization PHP performance indexing query caching database normalization

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