Thank you for your post. To make things a little bit complicated:
Suppose I have another table UserInformation
UserInfomation
{
userid integer referenes user(id),
mothername text
}
I would like methername also appear in the final join. Suppose each
user must have a mothername.
Could you please whow me the sql again?
Thanks again,
qq
Michael Fuhr wrote:
> On Sat, Jul 22, 2006 at 12:47:42PM -0700, [EMAIL PROTECTED] wrote:
> > I would like to join table user and userwork, where if a user has a
> > work, I list it. If he does not, I give it some default value "no work"
>
> You could use an outer join and COALESCE.
>
> http://www.postgresql.org/docs/8.1/interactive/tutorial-join.html
> http://www.postgresql.org/docs/8.1/interactive/queries-table-expressions.html#QUERIES-JOIN
> http://www.postgresql.org/docs/8.1/interactive/functions-conditional.html#AEN12639
>
> Example:
>
> SELECT u.id, u.name, u.address, COALESCE(uw.work, 'no work') AS work
> FROM "user" AS u
> LEFT OUTER JOIN userwork AS uw ON uw.userid = u.id;
>
> --
> Michael Fuhr
>
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