Question

I am having trouble using CASE when attempting to return the appropriate results based on whether a certain value is passed.

For example I would like to run a query if the suburb is passed

WHEN @suburb <> '' THEN
@suburb 
END
= [Suburb]
AND 
[City] = @city

However how do I only run the query so that when no suburb is passed it only uses the city?

Should I rather write the query as follows?

WHERE
(
    [Suburb] = @suburb
    AND
    [City] = @city
)
OR
(
    [City] = @city
)

Answer 1

You don’t really need CASE:

WHERE (suburb = @suburb OR @suburb = '' OR @suburb IS NULL) AND city = @city