Question

I Need to pass the return value of a function that is selected in previous column and pass it as parameter to a following function in the same row. I cannot use the alias:

What I want to have is:

SELECT
    dbo.GetSecondID(f.ID) as SecondID,
    dbo.GetThirdID(SecondID) as ThirdID
FROM Foo f

Any workaround? Thank you!

EDIT:

The method dbo.GetSecondID() is very heavy and I am dealing with a couple of million records in the table. It is not wise to pass the method as a parameter.

Answer 1

Bingo! The secret stand in applying a CROSS APPLY. The following code was helpful

SELECT
    sndID.SecondID,
    dbo.GetThirdID(sndID.SecondID) as ThirdID
FROM Foo f
CROSS APPLY
(
    SELECT dbo.GetSecondID(f.ID) as SecondID
) sndID

EDIT:

This only works if SecondID is unique (only one record is returned) or GROUP BY is used