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To play devil's advocate Prolog is considered much more similar to SQL than any other language and I suspect that will have an extremely high learning cost. That may be me being biased due to learning procedural languages first. At the same time I consider myself well versed in SQL.

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I think Prolog suffers in that comparison mostly because of its much more ambitious scope. Most non-developer/DBA people have no concept of what a SQL query is actually doing, whereas most nontrivial Prolog programs require conceptualizing the depth-first-search you're asking the language to perform in order to get it right. If you restricted your Prolog world to the kind of "do some inference on a simple family tree database of facts" that people first learn, Prolog would be pretty easy too.

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