In the current version of the docs here: http://developer.postgresql.org/pgdocs/postgres/functions-sequence.html
The lastval() function appears to be missing from table 9-38.
I don't see any obvious reason that it's left out.
Regards,
Jeff Davis
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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
match
