Stored Procedure Output

Question

I've got two stored procedures:

SP1

CREATE PROCEDURE GetAge

@Birthday datetime,
@BirthDayAge INT OUTPUT

AS

SELECT @BirthDayAge = YEAR(GETDATE()-DATEPART(dy, @Birthday) + 1)-YEAR(@Birthday);

SP2

CREATE PROCEDURE AgeProc

@Age int

AS

DECLARE @BirthDayAge INT;
EXEC GetAge @Age, @BirthDayAge OUTPUT

SELECT ... FROM ... WHERE @BirthdayAge  = @Age;

For some reason or other, no results are being returned in the second procedure when tested. Am I doing something wrong in either of the stored procedures?

Answer 1

 WHERE @BirthdayAge  = @Age;

you are comparing 2 variables.

Shouldnt one of this be a table column?

also, you are passing an integer to a datetime, that may cause issues