Question about GROUP BY and HAVING

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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