Question

Right off the bat – I’m quite new to ‘case when’. I read the following: How do I perform an IF…THEN in an SQL SELECT? however it didn’t really answer my question.

Essentially what I’m trying to do is something along the lines of the following:

select
    section_name, *
from
    property.lease_period lp
where
    lp.lease_current_stop_date < getdate() and (lp.lease_status = 'Active' or lp.lease_status = 'Overholding')
    and lp.period_id = @period_id
    and lp.building_id = @building_id
    and not exists
    (
        select 1
        from lease_deal.lease
        where lp.suite_name = tenancy_reference
        and lp.building_id = building_id
    )
    case when(@section_name <> 'ALL')
    then(and upper(section_name) = upper(@section_name))
    end
order by period_id desc

Is this possible? If so what am I doing wrong?

Tl;dr:

Essentially I would like:

and upper(section_name) = upper(@section_name)

To only apply to my where clause when @section_name is not equal to ‘ALL’

Answer 1

You just can change your (non-working) CASE to

AND (@section_name = 'ALL' OR upper(section_name) = upper(@section_name))