Question

I’ve got a student table and an enrollment table; a student could have multiple enrollment records that can be active or inactive.

I want to get a select that has a single student record and an indicator as to whether that student has active enrollments.

I thought about doing this in an inline UDF that uses the student ID in a join to the enrollment table, but I wonder if there’s a better way to do it in a single select statement.

The UDF call might look something like:

Select Student_Name,Student_Email,isEnrolled(Student_ID) from Student 

What might the alternative – with one SQL statement – look like?

Answer 1

select  Student_Name,         Student_Email,         (select count(*)           from Enrollment e           where e.student_id = s.student_id         ) Number_Of_Enrollments   from Student e 

will get the number of enrollments, which should help.