Re: query takes a long time

["marcin mank" <marcin.mank@xxxxxxxxx>]

select count(distinct attendance.studentid)

from attendance

where attendance.studentid not in (select studentid from attendance where auth not in('C','E','F','G','H','I','M','N','O','R','S','T','U'))

I am tired a lot now, but isn`t it the same as:

select count(distinct attendance.studentid)

from attendance

where auth in('C','E','F','G','H','I','M','N','O','R','S','T','U')

?