Question

For example:

CREATE PROCEDURE dbo.MyProc
AS
BEGIN
  SET NOCOUNT ON;
  BEGIN TRY
    ...
    DECLARE @Id INT;

    -- I don't want the following line to throw and abort processing. 
    -- I just want @Id to remain NULL. I can add a nested TRY/CATCH, but is there
    -- a better way?
    SET @Id=(SELECT Id FROM MyTable WHERE ...); 
    ...
  END TRY
  BEGIN CATCH
    ...
  END CATCH;
END;

Update: Just to clarify, if multiple rows are returned, I want @Id to stay NULL.

Answer 1

I will do something like this to avoid multiple rows errors:

SELECT top 1 @Id = Id FROM MyTable WHERE ...

or this

SELECT @Id = Id FROM MyTable WHERE ...
if @@rowcount > 1
   set @id = null

This last piece will set the @Id to null when there were multiple rows.