Troels' links: Relational database systems—Focusing on the SQL-standard, hierarchical and temporal data, and open source software. Related to SQL standards Unfortunately, the SQL standard isn't freely available; it must be bought from ISO or INCITS. You may also be able to leaf through (and perhaps even borrow) it at your local standards organization. Freely available resources: A late draft of the SQL:2011 standard. About SQL:2011's new
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