Question

SELECT DISTINCT
        Positions.Issuer_Name
    FROM
     Positions
        LEFT JOIN
        (
            SELECT DISTINCT
              [Assetid]
            FROM
                Report
        ) Report ON
            Report.[Assetid] = Positions.CUSIP //here instead of Report.[Assetid] i need to use `"right([Assetid], Len([Assetid])-1)"`

i need to use "right([Assetid], Len([Assetid])-1)" this which remove 1st letter and compare "Positions.CUSIP"

which is the better way to write this ?

instead of writing like

" ) Report ON
Report.right([Assetid], Len([Assetid])-1) = Positions.CUSIP"

should i declare variable and do "right([Assetid], Len([Assetid])-1)" first but how can i use it in JOIN then?

Answer 1

It depends on what you are trying to do, do you want to compare based on the right() value at that point or do you want the right() value prior to:

SELECT DISTINCT p.Issuer_Name
FROM Positions p
LEFT JOIN
(
    SELECT DISTINCT Right([Assetid], Len(Assetid)-1) TrimmedAssetid, [Assetid]
    FROM Report
) r 
    ON r.TrimedAssetid = p.CUSIP 

OR

SELECT DISTINCT p.Issuer_Name
FROM Positions p
LEFT JOIN
(
    SELECT DISTINCT [Assetid]
    FROM Report
) r 
    ON Right(r.Assetid,  Len(r.Assetid)-1)) = Positions.CUSIP