When using MYSQL GROUP BY WITH ROLLUP on Year(date) and Month(date) i am not able to change Null to 'Total'
问题 I want to create a table using GROUP BY WITH ROLLUP and get total rows instead of null. $sql ="SELECT IF(YEAR(transaktioner.datum) is null or YEAR(transaktioner.datum) = '','Total',YEAR(transaktioner.datum)) as Year, IF(MONTH(transaktioner.datum) is null or MONTH(transaktioner.datum) = '','Total',MONTH(transaktioner.datum)) as Month, SUM(transaktioner.belopp)*0.01 as Belopp FROM transaktioner GROUP BY Year, Month WITH ROLLUP "; $result = $conn->query($sql); if ($result->num_rows > 0) { //