"Chris Coleman" <ChristopherC@eurocom.co.uk> writes:
> When I run the trigger then this error appears in the logs:
> FATAL: BeginInternalSubTransaction: unexpected state END

See
http://archives.postgresql.org/pgsql...5/msg00383.php

regards, tom lane

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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
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