Possible to implement a manual increment with just simple SQL INSERT?

Question

I have a primary key that I don\'t want to auto increment (for various reasons) and so I\'m looking for a way to simply increment that field when I INSERT. By simply, I mean

Answer 1

It could be because there are no records so the sub query is returning NULL...try

INSERT INTO tblTest(RecordID, Text) 
VALUES ((SELECT ISNULL(MAX(RecordID), 0) + 1 FROM tblTest), 'asdf')