anyone have success with semi-joins?

From: <ryan_oracle_at_cox.net>
Date: Mon, 03 Nov 2003 07:04:25 -0800
Message-ID: <F001.005D5742.20031103070425@fatcity.com>

I picked up Mark Gurry's SQL pocket reference on Friday and it states that you can radically improve performance of 'where exists' statements by using semi-joins since it only returns the sub-query ones.

Now logically you have to return the sub-query repeatedly, this would only come into play if there are duplicates right?

anyone know the algorithm for the semi-join? Not just the result? I cant find it anywhere.

anyone ever hint this or let oracle decide?

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Author: <ryan_oracle_at_cox.net
  INET: ryan_oracle_at_cox.net

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