NOTE: use Perl; is on undef hiatus. You can read content, but you can't post it. More info will be forthcoming forthcomingly.

use Perl

All the Perl that's Practical to Extract and Report

The Fine Print: The following comments are owned by whoever posted them. We are not responsible for them in any way.

Without JavaScript enabled, you might want to use the classic discussion system instead. If you login, you can remember this preference.

That’s not an outer join (Score:1)

by Aristotle (5147)

An outer join is a join on a field which contains all rows from the left, right or both tables (left/right/full outer join, respectively). Wherever a row has to be included in the result set but could not be joined to a row in other the table, the other table’s column’s in that result set row are filled with NULLs.

A join that produces a Cartesian product is called a cross join. You can denote it explicitly in modern SQL dialects by saying something like
INSERT INTO perpetrators ( name ) SELECT
Cross Join, Not Outer Join: Thanks! (Score:1)

by Mark Leighton Fisher (4252)

You are right, the technique is the cross join. I rarely use anything other than inner joins, so I had forgotten the term. I've corrected the essay. Thanks!