# Date and Time and Databases - Exercise (Solution) – KNIME Community Hub **URL:** \ **Category:** KCH Workflows\ **Created:** [December 6, 2022, 10:25am UTC](https://forum.knime.com/t/date-and-time-and-databases-exercise-solution-knime-community-hub/52230 "2022-12-06T10:25:36Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Hub](https://forum-cdn.knime.com/user_avatar/forum.knime.com/hub/32/5438_2.png) [@Hub](https://forum.knime.com/u/Hub)\ **Post date:** [December 6, 2022, 10:25am UTC](https://forum.knime.com/t/date-and-time-and-databases-exercise-solution-knime-community-hub/52230/1 "2022-12-06T10:25:36Z")
This workflow shows a solution to a hands-on exercise in the L2-DS Introduction to KNIME Analytics Platform for Data Scientists - Advanced course * * * This is a companion discussion topic for the original entry at [https://hub.knime.com/-/spaces/-/latest/~EvfcYNp\_GpxzTkMN/](https://hub.knime.com/-/spaces/-/latest/~EvfcYNp_GpxzTkMN/) ---
**Author:** ![sdyballa](https://forum-cdn.knime.com/letter_avatar_proxy/v4/letter/s/51bf81/32.png) [@sdyballa](https://forum.knime.com/u/sdyballa)\ **Post date:** [August 15, 2023, 8:27am UTC](https://forum.knime.com/t/date-and-time-and-databases-exercise-solution-knime-community-hub/52230/2 "2023-08-15T08:27:18Z")
Hi All, unfortunately the DB Group By doesn’t work for me. Solution workflow also given me no results. I can get results using the native Groupby. I used DB Row filter in order to remove Null in needed fields. Any idea, why DB GroupBy doesn’t return any values? ---
**Author:** ![Hub](https://forum-cdn.knime.com/user_avatar/forum.knime.com/hub/32/5438_2.png) [@Hub](https://forum.knime.com/u/Hub)\ **Post date:** [August 15, 2023, 8:27am UTC](https://forum.knime.com/t/date-and-time-and-databases-exercise-solution-knime-community-hub/52230/3 "2023-08-15T08:27:18Z")