Re: Transitive Closure

"Alfredo Novoa" <alfredo_at_ncs.es> wrote in message news:e4330f45.0405161549.7f66ece8_at_posting.google.com...

> I prefer restriction. What selection does is a restriction.

Interesting. The literature used to use the word "selection" until the early 1980s, when SQL became the de facto standard interface language. At that point, the word "selection" began to be misinterpreted by people familiar with SQL, but not with relational operators. So the word "restriction" gradually displaced the word "selection".

But it was simply to avoid confusion, rather than for any fundamental liguistic reason. Or so it seems to me. Received on Mon May 17 2004 - 09:05:31 CDT