Hi Martin, just to make sure I understand properly, in your result by “_how many ads were listed each day_” , do you mean how many ads
• had the value of first_listed_date equal to that date
• or how many ads had that date between their first_listed_date and delisted_date (incl. empty delisted_date).
if it is the second one, then you are correct that you will probably need to expand your data in a table or a view to include row for each day when the ad was active, similar
to this question in the community.
Depending on which GoodData product are you using, in case of GD Cloud, you could do this also in a “SQL dataset” in your GoodData model (write a SQL query there), otherwise with GD Platform, you would need to do it in your database.