[PyQt] to display cotent of database between two dates

[atlass218]

when i said i didn't understand, it was about the usefulness of this code: since MySQL_1 and MySQL_2 have the form of a character string.
on the terminal, it is displayed:

SELECT * FROM correction_loc35R where date_correction between '01-12-2019' AND '28-12-2019' ORDER BY date_correction DESC

SELECT * FROM correction_loc35R where date_correction between start_date AND end_date ORDER BY date_correction DESC