22249. http://incubator.apache.org/cassandra/
The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
1636. http://dev.mysql.com/doc/refman/4.1/en/functions.html
Functions and Operators
3822. http://www.martinfowler.com/eaaCatalog/singleTableInheritance.html