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  3. October 2008

Re: Searching across three files

The SQL equivalent of multi-format logicals is the SQL UNION.

That sounds familiar -- oh, yes. I've used it.

Assuming that they have the fields defined the same way, you can simply bring them together with an SQL UNION.

I'm sure I could UNION two files together in an installation-specific version of the lookup program, but that's something I'd like to avoid, if possible. And of course, I could UNION the files together and pour the result into a file, but that would be a static snapshot. Is there a way to make a persistent, dynamic UNION, that behaves like a file?


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