Question about GROUP BY and double aggregation for example MAX (AVG (val))

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  Good afternoon
  
  I have the following query, which returns the desired result (a set of students who follow the CS112 or CS114 but not both). I wanted to 'condense' it in a single SELECT statement (if that's possible - DDL of execution of the instruction is provided at the end of this post):
  

  --
  -- is this select distinct * and its associated where clause absolutely
  -- necessary to obtain the result ?
  --
  
  select distinct *
    from (
          select s.sno,
                 s.sname,
                 s.age,
                 sum(case when t.cno in ('CS112', 'CS114')
                          then 1
                          else 0
                     end)
                   over (partition by s.sno) as takes_either_or_both
            from student s join take t
                             on (s.sno = t.sno)
         )
    where takes_either_or_both = 1
  ;

  The following text seemed reasonable, but unfortunately without success:
  

  /*
    Window functions not allowed here (in Having Clause)
  
  select max(s.sno),
         max(s.sname),
         max(s.age),
         sum(case when t.cno in ('CS112', 'CS114')
                  then 1
                  else 0
             end)
           over (partition by s.sno) as takes_either_or_both
    from student s join take t
                     on (s.sno = t.sno)
   group by s.sno
  having sum(case when t.cno in ('CS112', 'CS114')
                  then 1
                  else 0
             end)
           over (partition by s.sno) = 1
  ;
  
  */
  
  /*
  
  Invalid identifier in Having clause
  
  select s.sno,
         s.sname,
         s.age,
         sum(case when t.cno in ('CS112', 'CS114')
                  then 1
                  else 0
             end)
           over (partition by s.sno) as takes_either_or_both
    from student s join take t
                     on (s.sno = t.sno)
   group by s.sno, s.sname, s.age
  having takes_either_or_both = 1
  ;

  I tried a document that completely defines the order in which the clauses are executed. I found bits and pieces here and there but not complete something. I realize that my race with problems like this is due to my lack of understanding of the sequence and scope of the clauses that make a statement. For this reason, I can't even say if it is possible to write the query above using a single select statement. Forgive my little frustration...
  
  Thank you for your help,
  
  John.
  
  DDL follows.
  

          /* drop any preexisting tables */
  
          drop table student;
          drop table courses;
          drop table take;
  
          /* table of students */
  
          create table student
          ( sno integer,
            sname varchar(10),
            age integer
          );
  
          /* table of courses */
  
          create table courses
          ( cno varchar(5),
            title varchar(10),
            credits integer
          );
  
          /* table of students and the courses they take */
  
          create table take
          ( sno integer,
            cno varchar(5)
          );
  
          insert into student values (1,'AARON',20);
          insert into student values (2,'CHUCK',21);
          insert into student values (3,'DOUG',20);
          insert into student values (4,'MAGGIE',19);
          insert into student values (5,'STEVE',22);
          insert into student values (6,'JING',18);
          insert into student values (7,'BRIAN',21);
          insert into student values (8,'KAY',20);
          insert into student values (9,'GILLIAN',20);
          insert into student values (10,'CHAD',21);
  
          insert into courses values ('CS112','PHYSICS',4);
          insert into courses values ('CS113','CALCULUS',4);
          insert into courses values ('CS114','HISTORY',4);
  
          insert into take values (1,'CS112');
          insert into take values (1,'CS113');
          insert into take values (1,'CS114');
          insert into take values (2,'CS112');
          insert into take values (3,'CS112');
          insert into take values (3,'CS114');
          insert into take values (4,'CS112');
          insert into take values (4,'CS113');
          insert into take values (5,'CS113');
          insert into take values (6,'CS113');
          insert into take values (6,'CS114');

  Hi, John,.

  Just use the SUM aggregate function.

  --
          select s.sno,
                 s.sname,
                 s.age,
                 sum(case when t.cno in ('CS112', 'CS114')
                          then 1
                          else 0
                     end) as takes_either_or_both
            from student s join take t
                             on (s.sno = t.sno)
         GROUP BY  s.sno,
                  s.sname,
                s.age
         HAVING  sum(case when t.cno in ('CS112', 'CS114')
                          then 1
                          else 0
                     end)  = 1;
  

  Analytical functions are calculated after the WHERE - HAVING clause are applied. Use the results of an analytic function in a WHERE or HAVING clause, you need to calculate it in a subquery, and then you can use it in a WHERE - or the HAVING of a query clause Super.

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  sidc7 wrote:

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  sidc7 wrote:

  2 breaks: VMM examines the source interruptions prior to the interruption, so in a multicore environment, assuming a 2 processor core, how the VMM decides on the kernel for which the interruption in intended, prior to shipment of the interruption. Interruptions are tag ID, said core ID?

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  =========
  Please note the answers that you find useful and mark as answer - when is it :-) - so that others can easily find