Group by - condition

Question

Good Morning Everyone,
We wrote following query and we were happy about results.
SELECT DISTINCT R.CLASS_ID,LF.LOC_IND,U.LNAME, AF.A_CODE
FROM COURSES CO, CLE_USERS U, CLASSES C, REGISTRATIONS R,
CLASS_DETAILS CD, LOCATIONS_RF LF, FORMATS_RF FF, >SPONSORS_RF SF, B_RF BF, A_RF AF
WHERE ( (R.USER_ID = U.USER_ID) AND (R.CLASS_ID = C.CLASS_ID)>AND (CD.LOC_ID = LF.LOC_ID) AND (R.CLASS_DET_ID = CD.CLASS_DET_ID)
>AND (CD.FORMAT_ID = FF.FORMAT_ID) AND (C.COURSE_ID = CO.COURSE_ID)
>AND (C.SPONSOR_ID = SF.SPONSOR_ID) AND ( U.BARG_ID = BF.BARG_ID )
>AND ( U.A_ID = AF.A_ID )
>And (C.CLASS_ID = 52) )
Now, We have questions about group by:
If LF.LOC_IND is not equal to Y, we would like to gorup by AF.A_ID.
We assume that AND (LF.LOC_IND< not equal to >'Y') put in WHERE.
( We used not equal single-row query operator but it did not show in here. So, < not equal to > for description purpose)
But we confused to do how and where exactly.
If you have any expereinces, please share with us.
Thanks in advance,
NY

Answer 1

Thank SomeoneElse and all,
Our question is how to GROUP BY when LF.LOC_IND 'Y'.
MaxymK helped general idea but we are asking how to apply our query:
SELECT DISTINCT R.CLASS_ID,LF.LOC_IND,U.LNAME, AF.A_CODE
FROM COURSES CO, CLE_USERS U, CLASSES C, REGISTRATIONS R,
CLASS_DETAILS CD, LOCATIONS_RF LF, FORMATS_RF FF, >SPONSORS_RF SF, B_RF BF, A_RF AF
WHERE ( (R.USER_ID = U.USER_ID) AND (R.CLASS_ID = C.CLASS_ID)>AND (CD.LOC_ID = LF.LOC_ID) AND (R.CLASS_DET_ID = CD.CLASS_DET_ID)
>AND (CD.FORMAT_ID = FF.FORMAT_ID) AND (C.COURSE_ID = CO.COURSE_ID)
>AND (C.SPONSOR_ID = SF.SPONSOR_ID) AND ( U.BARG_ID = BF.BARG_ID )
>AND ( U.A_ID = AF.A_ID )
>And (C.CLASS_ID = 52) )
If you have any more questions for us, please let us know.
Thanks for all again,
NY