Below is my previous query updated to group rows by `pollDate` and to apply the aggregate function `sum()` on each of these groups: ``` SELECT pollDate, sum(import)/2.0 FROM Readings WHERE interval BETWEEN 1 AND 48 GROUP BY pollDate ```
Below is my previous query updated to group rows by `pollDate` and to apply the aggregate function `sum()` on each of these groups: ``` SELECT pollDate, sum(import)/2.0 FROM Readings WHERE interval BETWEEN 1 AND 48 GROUP BY pollDate ```