Warning: mysql_affected_rows() expects parameter 1 to be resource, boolean given in C:\xampp\htdocs\Timetable\timetable.php on line 90

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Take a moment to read https://www.daniweb.com/programming/threads/435023/read-this-before-posting-a-question

After that, add your line 90 for folk to take a look at.

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While you're at it. If you can start using mysqli or PDO, do it. mysql has been deprecated.

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