The help page for sqlQuery (RODBC 1.3.3 under R 2.13.1 on 64-bit
Windows 7) documents the 'errors' argument as:
errors: logical: if true halt and display error, else return '-1'.
In fact, with errors=TRUE, sqlQuery does not halt and display an
error; instead it behaves as documented in the Value section, which
reads:
...On error, if 'errors = TRUE' a character vector of error
message(s), otherwise...
That is, it displays nothing and returns a character-vector value.
May I suggest the maintainers update the document?
-s