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An error like this might be returned if you will try to connect to a port which is actually not the port DB2 server listens on. E.g. if I would, by mistake, try to connect to port 22 (ssh) I will get the same error: $ java -url jdbc:db2://localhost:22/SAMPLE -user db2v111 -password passw0rd [jcc][10521][13706]Command : java


Try adding the following to your sqldeveloper.conf: AddVMOption -Duser.language=en AddVMOption -Duser.region=US


You can use a subquery with the same table in both the primary and sub queries, join on trade_id = keyword_value Depending on how many levels a trade could have it might get complex, but this should get you going in the right direction.

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