What are some best practices for optimizing MySQL queries that involve grouping and selecting distinct values?

When optimizing MySQL queries that involve grouping and selecting distinct values, it is important to ensure that the appropriate indexes are in place to speed up the query execution. Using the GROUP BY clause efficiently and avoiding unnecessary calculations or joins can also help improve performance. Additionally, utilizing the DISTINCT keyword judiciously and limiting the number of selected columns can further enhance query optimization. 

// Example of optimizing MySQL query with grouping and selecting distinct values
$sql = "SELECT DISTINCT column_name FROM table_name WHERE condition GROUP BY column_name";
$result = mysqli_query($connection, $sql);

if (mysqli_num_rows($result) > 0) {
    while ($row = mysqli_fetch_assoc($result)) {
        // Process query results
    }
} else {
    echo "No results found";
}

Keywords

MySQL query optimization grouping distinct values performance tuning

Related Questions