I am using Enterprise Guide. I have many tables, which contain columns of dates, the format I have specified in answer before. When I manually want to extract data from a table, which is from a certain period, Then I make a new query, drag the columns of data that I need, and in the filter I put a column containing the date (eg open_date) between and write 12/1/23 and 12/31/23. Or another option is to write '1Dec2023:0:0:0'dt and '1Dec2023:0:0:0'dt... As I need it to refresh monthly, I don't want to manually change those dates every time, but I want to put this between &first_day_month_previous and &last_day_month_previous, so that when I start the project, it refreshes everywhere and contains data from the previous month. I hope it's understandable now. Sorry if it was not understandable so far.
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