Help writing a piece of SQL

Hi, I would appreciate some help writing a piece of SQL

PG803

My table/data looks like this:

username | domain | sendto

+-------------+-------------------------------+-------------------------
-----

Postmaster | intthit08.uk.rabbit.com | root

root | intthit08.uk.rabbit.com | is-unix(at)rabbit(dot)com

stoat.griffin | trusting.co.uk | stoat(dot)griffin(at)rabbit(dot)com

stoat.griffin | trusting.com | stoat(dot)griffin(at)rabbit(dot)com

stoat.griffin | rusty.co.uk | stoat(dot)griffin(at)rabbit(dot)com

stoat.griffin | rusty.com | stoat(dot)griffin(at)rabbit(dot)com

matilda.clematis | trusting.com |
matilda(dot)clematis(at)rabbit(dot)com

matilda.clematis | trusting.co.uk |
matilda(dot)clematis(at)rabbit(dot)com

matilda.clematis | rusty.co.uk |
matilda(dot)clematis(at)rabbit(dot)com

matilda.clematis | rusty.com |
matilda(dot)clematis(at)rabbit(dot)com

* | trusting.com | rusty(at)rabbit(dot)com

* | trusting.co.uk | rusty(at)rabbit(dot)com

* | rusty.co.uk | rusty(at)rabbit(dot)com

* | rusty.com | rusty(at)rabbit(dot)com

* | windoze.com | windoze(at)badger(dot)com

* | windoze.co.uk | windoze(at)badger(dot)com

admin | windoze.co.uk |
matilda(dot)clematis(at)rabbit(dot)com

admin | windoze.com |
matilda(dot)clematis(at)rabbit(dot)com

* | saxon.co.uk | superR(at)uk(dot)diamond(dot)com

* | saxon.com | superR(at)uk(dot)diamond(dot)com

The query will have the username and domain passed in as variables.

If the username and domain exist then return the sendto

The bit I'm struggling with is if the username doesn't exist then return
the sendto where the domain exists

e.g. username=fred (this doesn't exist) and domain=rusty.com then
return rusty(at)rabbit(dot)com, matilda(dot)clematis(at)rabbit(dot)com,
stoat(dot)griffin(at)rabbit(dot)com

Any help on this would very much appreciated; it's been driving me mad
for the last day.

Thanks

Nigel

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