A database object (default *default-database*).
accepts-n-syntax returns nil-t-required to indicate the behavior of the N syntax for string literals in the database specified by database. (The N syntax prefixes a string literal by the character N.)
the database will give an error.
the database accepts it but does not require it.
the database requires it (at least in some cases).
Currently, Microsoft SQL Server (which can be used via ODBC) is the only supported database that requires the N syntax for non-ASCII strings. SQLite and Microsoft Access (via ODBC) give errors. The other supported databases accept the syntax but do not need it.
LispWorks User Guide and Reference Manual - 20 Sep 2017