Question

I need to pull back records based on a location ID, but I’ve got two fields that MAY contain the incoming criteria….

something like this

SELECT * FROM tbl
WHERE myVar = locationID
    IF LocationID = 0
      myVar = location2ID

this is a ‘logical’ example…

I think I can do

WHERE myVar = CASE WHEN locationID = 0 THEN location2ID ELSE locationID END

although I’ve read that CASE in a WHERE clause should be avoided…? why? or is this OK?
– either way it FAILS

WHERE CASE WHEN locationID=0 THEN location2ID=myVAr ELSE locationID=myVar END

also FAILS

thx

Sorry for the confusion lads – didn’t mean to be “ambiguous” – looks like #2 will do what I want – but for the clarification requested here is the issue…

the table stores TWO locations, let’s call then CURRENT_LOC and ORIGINAL_LOC… in most cases these will BOTH have data, but in some cases the ‘thing’ hasn’t moved… so the CURRENT_LOC is ‘0’. MY issue is I’ll be passing in a LOCATION ID, I want the records where CURRENT_LOC matches OR if the the CURRENT_LOC=0 then I ALSO want the ORIGINAL_LOC… where that matches…

does that help the discussion? I hope.

Answer 1

WHERE myVar = COALESCE(NULLIF(locationID, 0), location2ID)

Alternatively,

WHERE (
       (locationID <> 0 AND myVar = locationID) 
       OR 
       (locationID = 0 AND myVar = location2ID)
      )