Alias Table Error...why?

From: Lance Prais <lprais_at_ts.checkpoint.com>
Date: Mon, 21 Jan 2002 17:00:38 -0800
Message-ID: <F001.003F68AA.20020121161518@fatcity.com>

I have the following SQL Statement but am getting and ORA-00904 Invalid Column Error. What Could I be doing wrong?

SELECT
  Launch.oc_session_id
FROM
  pt_client_eventdetails launch,
  pt_client_eventdetails logout
WHERE
   a.pc_session_user_name = 'tsokol'
   and (logout.pc_event_op = 'LAUNCH' and logout.pc_event_op <> 'LOGOUT' and logout.pc_event_op <> 'SOLUTION_VIEWED')

and launch.pc_session_id = logout.pc_session_id

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--

Author: Lance Prais
INET: lprais_at_ts.checkpoint.com

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