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The path is relative to where it starts from. Without any qualification ("inc/header.php"), it starts from the current directory, i.e. where the file doing the including is. With a leading slash ("/inc/header.php"), it will start at the root of the site. You might also be able to navigate "upwards", e.g. "../inc/header.php", but that's actively barred in some systems and will drive you mad if you have to refactor the site significantly. Regards, Phill W.

@gizmola With my model you would need to bring the ticket date into the equation SELECT s.id, s.row, s.seat_no FROM seat s LEFT JOIN booking b ON b.seat_id = s.id AND b.screening_id = 35 AND B.ticket_date = '2024-01-03' -- also required WHERE s.screen_id = 1 AND b.id IS NULL; As it is, a screening record states that the movie will be screened at time T each day between X and Y. On reflection, although requiring more rows, it would be better to have a screening record for every individual screening, giving... then your query would work as it is. Alternatively, to get vacant seats for a screening (and only requiring the screening id as input - if the screening id is known then the screen id is also known) you could SELECT s.id, s.row, s.seat_no FROM screening sg JOIN seat s ON sg.screen_id = s.screen_id LEFT JOIN booking b ON b.screening_id = sg.id AND b.seat_id = s.id WHERE sg.id = 35 AND b.id IS NULL