University Ingres Implemented the QUEL language, based on relational calculus and more elegant and powerful than SQL. [Free software] ftp://s2k-ftp.CS.Berkeley.EDU/pub/ingres ReviewsRating: Not yet Rated
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Database Research at Berkeley The original Ingres and Postgres systems, which implemented QUEL, which was relational. ftp://s2k-ftp.cs.berkeley.edu/pub/postgres/source.html#completed ReviewsRating: Not yet Rated
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