Distributed queries may be heterogeneous, supporting any OLE DB or ODBC data source. The SQL Server 7.0 compact disc includes OLE DB drivers for Oracle 7.x, Oracle 8.x, Microsoft Excel, Microsoft Access, dBASE, Paradox, and Microsoft Visual FoxPro database development system, as well as an ODBC gateway for other relational databases. OLE DB providers for other server databases (IBM DB2, SYBASE, and Informix) are available from third parties.