What is the source code behind Databases such as MySQL, Oracle, MS-SQL???
 

The people who invented MySQL, Oracle, and MS-SQL. I am just curious what is the source code behind these databases???

I am confused. Are they build on C-Sharp or are they actually using SQL source code. So, SQL is its own programming language?

For example, let us say an application such as newegg.com is build on C-SHARP, .net application. So, these databases are build on what kind of coding???

and how are they compiled? and release version?

I've only ever looked at the source for MySQL, it is written in C and C++. I believe MS-SQL and Oracle are also written in C and C++, but being closed source, I really don't know. Of course, Google probably has the answers you're looking for.

SQL isn't a programming language but a standardised method to access data from a relational database system. The server itself is referred as the backend. The frontend client is the CLI, GUI application via the server's API or web page via CGI,php programming etc that uses SQL to access data from the server.

The website and the database are two completely separate applications.

You are correct. Looks like C code.

http://bazaar.launchpad.net/~mysql/m...rver/5.5/files