Are there any best practices for using DISTINCT in PHP to optimize performance?

Using DISTINCT in SQL queries can impact performance, especially on large datasets. To optimize performance, it is recommended to only use DISTINCT when necessary and to ensure that the query is properly indexed. Additionally, consider using other techniques such as GROUP BY or filtering data in PHP if possible. 

// Example of using DISTINCT in PHP with optimization
$query = "SELECT DISTINCT column_name FROM table_name WHERE condition";
$result = mysqli_query($connection, $query);

while($row = mysqli_fetch_assoc($result)) {
    // Process the data
}

Keywords

DISTINCT PHP optimization performance best practices

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