Controls whether double quotation marks are interpreted as string literals or delimited identifiers. If you specify SQL99, SQL92, SQL89, or MIA, SQL interprets double quotation marks as delimited identifiers. If you specify SQLV40, SQL interprets double quotation marks as literals. The default is SQLV40. Use the QUOTING RULES clause, rather than the ANSI_QUOTING qualifier, because the qualifier will be deprecated in a future release.