Counting Number Of Records In Relation To A Query

Hi all,

Is there any option to count the number or records relating to
a specific field. Here is the details..The db is for a school and there is a tables for
class and students. I am using a form to enter students details. I had created a
relationship with these two tables. i am using a query to get the details regarding a specific
class like classname, class teacher like that.. Is there any way to calculate the number of students in that specific class.

now i am using the query as follows

SELECT Class.*
FROM Class
WHERE (((Class.ClassID)=[Forms]![Class]![ClassID]));

I had created the relationship with the above two tables with classid as the primary key


thanks in advance

Thanks