Why is “Yes” a value of -1 in MS Access database?

Question

I\'m looking at linked data in MS Access.

The \"Yes/No\" fields contain the value -1 for YES and 0 for NO. Can someone explain why such a counter-intuitive value is used

Answer 1

"Yes" is -1 because it isn't anything else.

When dealing with Microsoft products, especially one as old as Access, don't assume that there is a good reason for any design choice.