How can SQL queries be optimized in PHP to improve performance when retrieving data for display?

To optimize SQL queries in PHP for improved performance when retrieving data for display, it is important to use indexed columns in the WHERE clause, limit the number of columns being selected to only those needed, and avoid using SELECT * to fetch all columns unnecessarily. Additionally, utilizing prepared statements can help prevent SQL injection attacks and improve query execution speed. 

// Example of optimizing SQL query in PHP
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

// Prepare a SQL query with placeholders
$stmt = $pdo->prepare("SELECT column1, column2 FROM mytable WHERE indexed_column = :value");

// Bind parameter values
$stmt->bindParam(':value', $value, PDO::PARAM_STR);

// Execute the query
$stmt->execute();

// Fetch and display results
while ($row = $stmt->fetch()) {
    echo $row['column1'] . ' - ' . $row['column2'] . '<br>';
}

Keywords

SQL optimization PHP performance data retrieval display

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