Joining two tables & group by name
I am trying to write a SQL query where it collects the User info along with UserPhotos. For some reason my query results in returning same user info with a different photo URL.
How to get each average of multiple items?
There is a table storing name, speed and timestamp of cars. Each car sends its speed at irregular time intervals, some send more often, some may have not sent their data for a couple of hours, simplified example (real table has 20 cars and roughly 3000 lines each):