Question

For these tables here (circled)

https://i.stack.imgur.com/zDx8X.jpg

What would the best join be to use for them , I tried using OUTER join but it would not return any rows even if there was matching data.

Thanks

QUERY

select *

from 

hr

OUTER JOIN

hr

ON

hr.procedure_id = procedure.procedure_id

OUTER JOIN

staff

ON

staff.staff_id = hr.staff_id

Where hr.procedure_id = procedure.procedure_id

Answer 1

What you probably want is this:

select p.*, hr.*, s.*
from procedure p
left outer join hr on p.procedure_id = hr.procedure_id
left outer join staff s on hr.staff_id = s.staff_id

That will give you results unless there are no rows in procedure.

There are different ways that you could put these together, though, depending on what exactly you want. I don’t know what “hr” stands for here, so I can’t use common sense to figure that out.