how do I count the data plus list the data









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I am very very new to SQL



For example, a student with 2 As and 3 Cs will produce two records: sid, A, 2; sid, C, 3. If the student doesn't have any grades I don't want them listed



select sid, count(grade) from enrollments
group by sid


Example of what I want:



sid grade
123 A,2; C,3
456 A,3; B,1









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    up vote
    0
    down vote

    favorite












    I am very very new to SQL



    For example, a student with 2 As and 3 Cs will produce two records: sid, A, 2; sid, C, 3. If the student doesn't have any grades I don't want them listed



    select sid, count(grade) from enrollments
    group by sid


    Example of what I want:



    sid grade
    123 A,2; C,3
    456 A,3; B,1









    share|improve this question

























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I am very very new to SQL



      For example, a student with 2 As and 3 Cs will produce two records: sid, A, 2; sid, C, 3. If the student doesn't have any grades I don't want them listed



      select sid, count(grade) from enrollments
      group by sid


      Example of what I want:



      sid grade
      123 A,2; C,3
      456 A,3; B,1









      share|improve this question















      I am very very new to SQL



      For example, a student with 2 As and 3 Cs will produce two records: sid, A, 2; sid, C, 3. If the student doesn't have any grades I don't want them listed



      select sid, count(grade) from enrollments
      group by sid


      Example of what I want:



      sid grade
      123 A,2; C,3
      456 A,3; B,1






      sql oracle






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 9 at 19:26









      Littlefoot

      18.1k51333




      18.1k51333










      asked Nov 9 at 19:20









      Hollywoodhd

      42




      42






















          1 Answer
          1






          active

          oldest

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          up vote
          1
          down vote













          I think this should work for you.



          select sid, 
          listagg(gradecount, '; ') within group (order by gradecount) as grade
          from (
          select sid, grade || ',' || count(1) as gradecount
          from enrollments
          where grade is not null
          group by sid, grade
          ) studentgradecount
          group by sid;


          If it seems confusing, try running the inner query by itself to see what it does:



          select sid, grade || ',' || count(1) as gradecount
          from enrollments
          where grade is not null
          group by sid, grade





          share|improve this answer




















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            1 Answer
            1






            active

            oldest

            votes








            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes








            up vote
            1
            down vote













            I think this should work for you.



            select sid, 
            listagg(gradecount, '; ') within group (order by gradecount) as grade
            from (
            select sid, grade || ',' || count(1) as gradecount
            from enrollments
            where grade is not null
            group by sid, grade
            ) studentgradecount
            group by sid;


            If it seems confusing, try running the inner query by itself to see what it does:



            select sid, grade || ',' || count(1) as gradecount
            from enrollments
            where grade is not null
            group by sid, grade





            share|improve this answer
























              up vote
              1
              down vote













              I think this should work for you.



              select sid, 
              listagg(gradecount, '; ') within group (order by gradecount) as grade
              from (
              select sid, grade || ',' || count(1) as gradecount
              from enrollments
              where grade is not null
              group by sid, grade
              ) studentgradecount
              group by sid;


              If it seems confusing, try running the inner query by itself to see what it does:



              select sid, grade || ',' || count(1) as gradecount
              from enrollments
              where grade is not null
              group by sid, grade





              share|improve this answer






















                up vote
                1
                down vote










                up vote
                1
                down vote









                I think this should work for you.



                select sid, 
                listagg(gradecount, '; ') within group (order by gradecount) as grade
                from (
                select sid, grade || ',' || count(1) as gradecount
                from enrollments
                where grade is not null
                group by sid, grade
                ) studentgradecount
                group by sid;


                If it seems confusing, try running the inner query by itself to see what it does:



                select sid, grade || ',' || count(1) as gradecount
                from enrollments
                where grade is not null
                group by sid, grade





                share|improve this answer












                I think this should work for you.



                select sid, 
                listagg(gradecount, '; ') within group (order by gradecount) as grade
                from (
                select sid, grade || ',' || count(1) as gradecount
                from enrollments
                where grade is not null
                group by sid, grade
                ) studentgradecount
                group by sid;


                If it seems confusing, try running the inner query by itself to see what it does:



                select sid, grade || ',' || count(1) as gradecount
                from enrollments
                where grade is not null
                group by sid, grade






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 9 at 20:33









                kfinity

                2,6341514




                2,6341514



























                     

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