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> built one for Java, in the early 90s

So was your ORM for Oak? Java didn't hit the public sphere until 1995 IIRC

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ORMs are so incredibly finicky. I still remember using old Linq-to-SQL (not Entity Framework) and I had to write the linq query in the reverse order of what I expected or it created 3 nested subqueries instead of just joining the tables together. That was when I learned to instantly double check every ORM query I wrote.
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> Linq-to-SQL (not Entity Framework) and I had to write the linq query in the reverse order

I remember those times! Had to write the LINQ, see what it compiled to, redo, until the query was efficient. Abuse LINQ subtleties in how it generated JOIN predicates since it only supported equality. Something about finding an equivalent way of expressing a query with sub-selects that is also computationally equivalent. All so I can get my efficient SQL without writing SQL. So silly.

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