You can query across databases in Oracle and Sql Server, with a little work. I'm not sure about access. <BR>It really would be easier to just link the tables I would think.

Query is a request for data. In this article we are going to explain how to create and modify query in Microsoft Access the easy way.

While I have never used SQL Server Reporting Services, it seems to have a lot of advantages over an Access-based reporting tool.

SQL and the Web Many popular websites are backed by SQL databases, which they use to pull user-specific data and data responsive to particular user queries as people navigate their sites.

You don't have to give up using dynamic SQL just because you're using Entity Framework. The Entity Framework SqlQuery method will give you back the flexibility of dynamic SQL and still let you work ...

PostgreSQL foreign data wrappers are a great way to expose APIs to SQL. And SQL is a great way to reason over the data.

That means they’re faster than Access queries. Transact-SQL (T-SQL) provides procedural extensions to SQL, allowing you to build more sophisticated queries.

Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement.