• You could also look at QuoteName()

    DECLARE @quote Char(1)

    SET @quote = ''''

    PRINT 'WHERE LastName = ' + QuoteName( @LName, @quote )

    PRINT 'WHERE TDate = ' + QuoteName( GetDate(), @quote )

    PRINT 'WHERE LDate = ' + QuoteName( GetDate() - 100, @quote )