sql - where is something wrong with my query? -

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 with  as StudentTakes (name, id, curriculum_id) (choose name, student.id, course_id Take the student to join.Ed = Student.Id. Select a different name, ID from the student, where in an anonymity (student selection b.name b where b.name = a.name and b.id  A.id and A.course_id = b.course_id);

I want to find the student's name and id , each of which has the same name with other students, and Students have the same name, they should read in that class which has the same course_id table takes in ID and course_id < / Code>. The table student has id and name . Those students with similar names are 788 and the result of the above question is 755. Can someone explain that when I change the above code, then the result is 788 . With studenttakes (name, id, course_id) (select name, student.id, course_id from le.ad = student.id by joining the student) 

  select a different name, StudentTakes A to id where a.name (select b.name from StudentTakes b where b.name = a.name and b.id  a.id and a.course_id  course_id - CHANGE) Order by name;

It appears that your questions are telling you

  1. There are 755 students, who take the same name (first query) in the same class, and
  2. 788 students who have at least one class with the same name for each < / Li>

These results are not incompatible incompatible.


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