https://www.schoolofhaskell.com/school/to-infinity-and-beyond/pick-of-the-week/guide-to-ghc-extensions/list-and-comprehension-extensions https://www.schoolofhas

https://www.schoolofhaskell.com/school/to-infinity-and-beyond/pick-of-the-week/guide-to-ghc-extensions/list-and-comprehension-extensions https://www.schoolofhaskell.com/school/to-infinity-and-beyon... See TransformListComprehension section. Haskell uses tricks from SQL while still having nice syntax. http://ekmett.github.io/discrimination/ http://ekmett.github.io/discrimination/ - a library to perform what SQL engines do for optimization of relational queries, online and in Haskell.