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select sum(point) from schedule_booking where idx_student= and (date>'20180423' or (date='20180423' and class_end>'1431'))

1064 : You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'and (date>'20180423' or (date='20180423' and class_end>'1431'))' at line 1

error file : /my.page.php