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SELECT COUNT(ID) FROM wp_postmeta post_meta INNER JOIN wp_posts assignment ON post_meta.post_id = assignment.ID AND post_meta.meta_key = '_tutor_course_id_for_assignments' WHERE post_type = 'tutor_assignments' AND assignment.post_parent>0 AND post_meta.meta_value IN()

WordPress database error: [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 ') ORDER BY ID DESC LIMIT 0, 20' at line 8]
SELECT * FROM wp_postmeta post_meta INNER JOIN wp_posts assignment ON post_meta.post_id = assignment.ID AND post_meta.meta_key = '_tutor_course_id_for_assignments' WHERE post_type = 'tutor_assignments' AND assignment.post_parent>0 AND post_meta.meta_value IN() ORDER BY ID DESC LIMIT 0, 20