>I got a feeling this isn't possible, but I thought I'd ask just in case. I want to do something like this:
>
>SELECT trips
>DELETE ALL FOR trips.client_num NOT IN (SELECT client_num FROM clients)
>
>Basically, there's a lot of orphaned trips in the table and I want to clear them out. Is there any way to do that short of scanning through the trips table and looking up each client_num?
>
>Thanks,
>
Hi Michelle,

A couple of additions to what Ken and Ed told you. If the table is part of a DBC and the database isn't current you'll need to use the Datebase!Table type syntax.

The other thing worth mentioning is that unlike the DELETE command, DELETE - SQL uses record locking to mark multiple records for deletion. This means that you'll take a performance hit, unless you open the table exclusively. If that's not possible, in addition to the other solution, you can use the following to improve performance.

SELECT Clients.Client_Num;
  FROM Clients;
  ORDER BY Clients.Client_Num;
  INTO ARRAY a_clients
SELECT Trips
DELETE ALL FOR ASCAN(a_clients, Trips.Client_Num) = 0

hth,