Learn how to use SQL in Microsoft Access with this step-by-step guide, complete with examples, FAQs, and tips for better database management.

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.

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

If you're using Access I recommend just using the QBE Grid. There you can add two or more tables to the query, drag the fields you want in the lower part, and then for activityID put the necessary ...

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

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