| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Corey Huinker <corey(dot)huinker(at)gmail(dot)com> |
| Cc: | Joel Jacobson <joel(at)compiler(dot)org>, Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, vignesh C <vignesh21(at)gmail(dot)com>, pgsql-hackers(at)lists(dot)postgresql(dot)org, Marko Tiikkaja <marko(at)joh(dot)to> |
| Subject: | Re: Document efficient self-joins / UPDATE LIMIT techniques. |
| Date: | 2024-04-07 20:29:03 |
| Message-ID: | 2917006.1712521743@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Corey Huinker <corey(dot)huinker(at)gmail(dot)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
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