SQL Server Native Client (SNAC) is not supported beyond SQL Server 2012. Avoid using SNAC in new development work, and plan to modify applications that currently use it. The Microsoft ODBC Driver for SQL Server provides native connectivity from Windows to Microsoft SQL Server and Microsoft Azure SQL Database.
A stored procedure (Stored Procedures (Database Engine)) is an executable object stored in a database. SQL Server supports:
One or more SQL statements that have been precompiled into a single executable procedure.
Extended stored procedures
C or C++ dynamic-link libraries (DLLs) written to the SQL Server Open Data Services API for extended stored procedures. The Open Data Services API extends the capabilities of stored procedures to include C or C++ code.