psql (9.6.7, server 11.3) on linux
I want to do something like this
(intentionally bad sql but will illustrate the need)
select s.name,s.grade from students s where s.class='math'
union
select 'whole class', class_grade from all_classes where class=s.class
Of course it's that "where class=s.class" that's a foul.
In English, I want a list of each math student and their grade and then
append one more record for the entire class, a record that comes from a
different table but narrowed down to that one class.
I don't care if union isn't the right approach. Anything that works is
welcome !
Thanks in Advance