> most (if not all?) of posgresql's major competitor's (mysql, sql > server, db2, etc) support a single bit integer datatype.
> A couple of times I've been told "you don't need tinyint, use > boolean" which is not true, several projects I've worked on I've > needed and integer field that supports number within a small range > 0-5 1-10 1-100 or something similar.
I think you mean byte where you've said bit. Boolean would be adequate for a single bit, and I haven't (so far) seen any database which supports both a single-bit type and a boolean. Many databases support a TINYINT type as a single-byte value, although I'm not sure there's consistency on whether that's a signed or unsigned value.