Question

Does anyone know if it is possible to write a query that can produce the following output based on the below tables?

I have managed to create the below results by creating three separate queries and passing the previous queries’ result set into the next query. But I was hoping for a more efficient way.

I want this output using ONE SQL if possible?

          baseball  computer  laptop
Jane Doe  5                  
Joe Blogs           8         8

These are the tables I have to work with:

persons table

id    first_name  last_name
101   Jane        Doe
576   Joe         Blogs

hobbies table

id hobby_type   hours_spent
1  sports       5
2  technology   8

hobby_types table

id name
33 computer
39 baseball
45 laptop

persons_hobbies join-table for person and hobbies

id person_id hobby_id
1  101      1
3  576      1
2  576      2

hobbies_hobby_types join-table for hobbies and hobby_types

hobby_id hobby_type_id 
1        39
2        33
3        45

Answer 1

You are trying to get a so-called pivot table.

I’m afraid there is no way to do it in MySQL with an unlimited number of columns, but maybe I’m wrong. Use your newly learned keyword to find a lot of information on this topic.