Sue Humphrey <[EMAIL PROTECTED]> writes:
> I would like examples of functions using update, insert and
> delete, where LANGUAGE 'SQL', both how to write them and how to
> use them.

Have you read the documentation?

http://www.ca.postgresql.org/users-lounge/docs/7.2/postgres/xfunc-sql.html

The first couple of examples seem to cover the territory ...

                        regards, tom lane

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