syntax error (missing operator) in ms access

Question

I'm trying to use the following query, however it is saying missing operator and syntax error. This problem is with ms access.

select s.student_id, e.average_second_year_marks, e.average_third_year_marks, e.overall_marks
from students s
join
(
  select student_id,
    avg(case when program_year_when_enrolled = 'Second' then marks_obtained end)
      as average_second_year_marks,
    avg(case when program_year_when_enrolled = 'Third' then marks_obtained end)
      as average_third_year_marks,
    (
     (sum(case when program_year_when_enrolled = 'Second' then marks_obtained end) * 1.0) +
     (sum(case when program_year_when_enrolled = 'Third' then marks_obtained end) * 2.0)
    ) / 3.0 as overall_marks
  from enrollment
  group by student_id
) e on e.student_id = s.student_id
where s.course_current_status = 'Graduated-2017'

If this about Microsoft Access, why did you tag MySQL and Postgres then? I removed the tags. Please only add tags that are relevant. — sticky bit
– sticky bit, Commented Apr 29, 2019 at 19:54
MS Access doesn't support the 'CASE' statement, you will need to convert those into iif statements. — Fink
– Fink, Commented Apr 29, 2019 at 20:03

Gordon Linoff · Accepted Answer · 2019-04-29 20:14:27Z

The equivalent MS Access query would be more like this:

select s.student_id, e.average_second_year_marks,
       e.average_third_year_marks, e.overall_marks
from students as s inner join
     (select student_id,
             avg(iif(program_year_when_enrolled = "Second", marks_obtained, NULL)) as average_second_year_marks,
             avg(iif(program_year_when_enrolled = "Third", marks_obtained, NULL)) as average_third_year_marks
             (1.0 * avg(iif(program_year_when_enrolled = "Second", marks_obtained, NULL)) +
              2.0 * avg(iif(program_year_when_enrolled = "Third", marks_obtained, NULL)) 
             ) / 3.0 as overall_marks
     from enrollment
     group by student_id
    ) as e 
    on e.student_id = s.student_id
where s.course_current_status = "Graduated-2017";

It's saying syntax error in join clause but when I use another join such as a left join or outer join it then says syntax errors in join operation. Can you please help what I should do with it.

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