Relational (inner) joins are really common in the world of databases, and one weird thing about them is that it seems like everyone has a different idea of what they are. In this post I’ve aggregated a bunch of different definitions, ways of thinking about them, and ways of implementing them that will hopefully be interesting. They’re not without redundancy, some of them are arguably the same, but I think they’re all interesting perspectives nonetheless.
restSQL is an ultra-lightweight data access layer for HTTP clients. restSQL is a persistence framework or engine in the middle tier of a classic three tier architecture: client, application server and database. It may also be embedded in any middle-tier as a Java library.
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