Re: SQL queries as sets: was The tragedy of SQL

From: rob stone <floriparob(at)gmail(dot)com>
To: Steve Litt <slitt(at)troubleshooters(dot)com>, pgsql-general(at)lists(dot)postgresql(dot)org
Subject: Re: SQL queries as sets: was The tragedy of SQL
Date: 2021-09-15 08:51:09
Message-ID: 183103615291173300fbfad8087a758067d81d7d.camel@gmail.com
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>
> Rich, could you please elaborate on SQL queries being based on sets?
> I
> never thought of it that way, and would like to hear your related
> thoughts.
>
When Codd & Date elaborated the relational model, it was based on set
theory.
You have sets of data. Is there a relationship between them? If so, how
do you express it? SQL came to exist.

My two cents.

> SteveT
>
> Steve Litt
> Spring 2021 featured book: Troubleshooting Techniques of the
> Successful
> Technologist http://www.troubleshooters.com/techniques
>
>

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