Question

I have a simple and silly doubt in sql.
I have to write down a query like the one below.
Here, id is not unique. But when i do the following query i get unique values as output. How do i get multiple values?

select name from students_table where id in (select id from students_id);

Ex : Lets say students_table has name   id
                                 -----  ---
                                 john    1
                                 jack    2

     And students_id table has   id    
                                 ---
                                  1
                                  1
                                  1
                                  2
                                  ...

If i write the query in the above way i get name
                                            ----
                                            john
                                            jack

Instead i want my output as name
                            ----
                            john
                            john
                            john
                            jack

Answer 1

select st.name from students_id si
join students_table st on st.id = si.id;