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SQL servers are all generically related. But different databases have different features that extend the SQL standard.
So in Windows you have access and MS-SQL and then things like Oracle.
in Linux you have cloudscape (a java based sql database) and mySQL andf then PostgreSQL which basically break down on the same lines. So if you are using ms SQL on Windows I would recommend mySQL on Linux. DO your scripting and web forms with php and use apache web server to server it to your users. (All of these are open source like Linux.)