>> I remember to see one time in the standard something related to indexes
>> (from API POV) starting at 1. But can't found now. But for ORDER BY and
>> GROUP BY, they start at 1.
> CLI (Call Level Interface) part of SQL standard uses 1-based column
> indexes.
>

I don't read all previous posts, sorry :)

OLEDB Specification:
- Columns (and Parameters) has one-based order.
- Zero number of column reserved for special-column with bookmark.

---
API Interface != End User Interface.

For example - ADODB (High level for OLEDB) and my C++ Library for OLEDB use
the zero-based access to columns and parameters.

Regards,
Dmitry Kovalenko