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Re:ISBL: Information Systems Base Language Implemented in Tcl by rramadass on Wednesday January 31, 2024 @08:12AM (#39203336)
Nice! It has a succinct overview of the Relational Model before discussing ISBL.

There was a earlier thread today which is an interview with Chris Date where he mentions that QBE and ISBL are more "Relational" than SQL - https://news.ycombinator.com/item?id=39189015

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