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Learn Datalog Today

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Re: Learn Datalog Today

#3

Post by SJC_Hacker »

I learned a bit of Datalog back in university, too many years ago. It was impressive how powerful the query language is. You could do in a single line what required several lines of SQL, and far more intuitively.

But ... the problem is how many DBs support it, and how useful of a skill it is to know.

Re: Learn Datalog Today

#4

Post by FreeFull »

It's a shame that there doesn't seem to be any decent open-source implementation of Datalog. If you go for full Prolog instead of Datalog, there are several (Scryer Prolog being my personal favourite).

Re: Learn Datalog Today

#5

Post by cmrdporcupine »

FreeFull wrote: post #4

It's a shame that there doesn't seem to be any decent open-source implementation of Datalog. If you go for full Prolog instead of Datalog, there are several (Scryer Prolog being my personal favourite).

https://en.wikipedia.org/wiki/Souffl%C3%A9_(programming_lang...

https://github.com/souffle-lang/souffle

Re: Learn Datalog Today

#7

Post by nezaj »

FreeFull wrote: post #4

It's a shame that there doesn't seem to be any decent open-source implementation of Datalog. If you go for full Prolog instead of Datalog, there are several (Scryer Prolog being my personal favourite).

Here’s a blog post showing you how to roll your own in ~100 lines of JS

https://www.instantdb.com/essays/datalogjs

Re: Learn Datalog Today

#8

Post by kjqgqkejbfefn »

FreeFull wrote: post #4

It's a shame that there doesn't seem to be any decent open-source implementation of Datalog. If you go for full Prolog instead of Datalog, there are several (Scryer Prolog being my personal favourite).

1. Datomic - While not open-source, it has an open-source version called Datomic Free, which is a distributed database designed to enable scalable, flexible, and intelligent data storage and queries. Datomic's query language is closely inspired by Datalog.

2. DataScript - An open-source in-memory database and query engine for Clojure, ClojureScript, and JavaScript that is heavily influenced by Datalog and Datomic.

3. Crux (now XTDB) - A bitemporal database with Datalog-inspired querying capabilities. It is designed for efficient querying of historical data and offers ACID transactions.

4. Racket's miniKanren - While not strictly a database, miniKanren is an open-source logic programming extension to the Racket language, which is inspired by Datalog and can be used to manipulate and query data in a manner similar to Prolog.

5. LogicBlox - An open-source platform that combines a database system, a Datalog-based modeling language, and application server facilities. It allows developers to build complex, data-intensive applications.

6. Soufflé - A Datalog-inspired language that is designed for static analysis problems. It can be viewed as a database query language with a focus on performance, allowing for parallel execution of queries.

7. Dedalus - A Datalog-like temporal logic language used to express complex distributed systems. It is primarily a research tool but has informed the design of other Datalog-inspired systems.

8. Flora-2 - An open-source object-oriented knowledge representation and reasoning system that integrates a variant of Datalog with objects and frames.

Top 3 are from the Clojure ecosystem. Additionnaly in this same space there is Datalevin & Datahike among many others

Re: Learn Datalog Today

#9

Post by packetlost »

grepexdev wrote: post #6

I thought that syntax looked familiar! Looks like Logseq uses Datalog for advanced queries. https://hub.logseq.com/features/av5LyiLi5xS7EFQXy4h4K8/getti...

More specifically, Logseq uses DataScript, a Datomic-inspired Datalog engine for ClojureScript.

Re: Learn Datalog Today

#10

Post by persnickety »

kjqgqkejbfefn wrote: post #8
FreeFull wrote: post #4

It's a shame that there doesn't seem to be any decent open-source implementation of Datalog. If you go for full Prolog instead of Datalog, there are several (Scryer Prolog being my personal favourite).

1. Datomic - While not open-source, it has an open-source version called Datomic Free, which is a distributed database designed to enable scalable, flexible, and intelligent data storage and queries. Datomic's query language is closely inspired by Datalog. 2. DataScript - An open-source in-memory database and query engine for Clojure, ClojureScript, and JavaScript that is heavily influenced by Datalog and Datomic. 3.…

Cozo uses Datalog for queries, and has several backends, including SQLite
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