What steps can be taken to troubleshoot and resolve issues with empty result sets when calculating averages in PHP using SQL queries?

When calculating averages in PHP using SQL queries, empty result sets can occur if there are no records to calculate the average from. To resolve this issue, you can check if the result set is empty before calculating the average and handle it accordingly, such as by setting a default value or displaying a message to the user. 

// Perform SQL query to get the sum and count of values
$query = "SELECT SUM(value) as total, COUNT(value) as count FROM table_name";
$result = mysqli_query($connection, $query);

if(mysqli_num_rows($result) > 0){
    $row = mysqli_fetch_assoc($result);
    $average = $row['total'] / $row['count'];
    echo "Average value: " . $average;
} else {
    echo "No records found to calculate average.";
}

Keywords

PHP SQL queries empty result sets troubleshooting averages.

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