Re: Document efficient self-joins / UPDATE LIMIT techniques.

Corey Huinker <corey.huinker@gmail.com> writes:
>> I've also used the technique quite a lot, but only using the PK,
>> didn't know about the ctid trick, so many thanks for documenting it.

> tid-scans only became a thing a few versions ago (12?). Prior to that, PK
> was the only way to go.

I think we had TID scans for awhile before it was possible to use
them in joins, although I don't recall the details of that.
Anyway, pushed after some additional wordsmithing.

            regards, tom lane