Open AlisdairO opened 6 years ago
This exercise: https://pgexercises.com/questions/aggregates/payback.html
Could use some explanation about why the group by works with the PK and not just all the fields.
This exercise: https://pgexercises.com/questions/aggregates/payback.html
Could use some explanation about why the group by works with the PK and not just all the fields.