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Spreadsheets have shown ubiquitous use by scientists, business and financial analysts, researchers and lay users. However, spreadsheets can not express complex operations (for example, joins), can not handle large sets of data, do not support collaboration, and do not promote errors, redundancy, and ... [More] errors. obsolete data. On the other hand, relational databases are known to be powerful and scalable, but they are not flexible, intuitive, or interactive. DataSpread solves these problems by holistically unifying spreadsheets with databases: keeps spreadsheets as front-end and databases as a back-end. [Less]