Re: select distinct and order by
| От | Viorel Dragomir |
|---|---|
| Тема | Re: select distinct and order by |
| Дата | |
| Msg-id | 01f201c42d06$c34020b0$6500a8c0@wylog.local обсуждение исходный текст |
| Ответ на | select distinct and order by ("Stijn Vanroye" <s.vanroye@farcourier.com>) |
| Список | pgsql-sql |
I don't know if this will work, but why not try it ? :)
select distinct fullname, distinct staff_id, loginname from staff
where staff_id in
(select staff_id from staffmembership where staffgroup_id=#SomeIdValue#)
order by fullname, staff_id
where staff_id in
(select staff_id from staffmembership where staffgroup_id=#SomeIdValue#)
order by fullname, staff_id
Next one is more complicate but with more chances to succeed :)
select staff_id, fullname, loginname from (
select distinct on (staff_id) staff_id, fullname, loginname from staff
where staff_id in
(select staff_id from staffmembership where staffgroup_id=#SomeIdValue#)
order by staff_id
where staff_id in
(select staff_id from staffmembership where staffgroup_id=#SomeIdValue#)
order by staff_id
)
order by fullname
Let me know
:)
----- Original Message -----From: Stijn VanroyeSent: Wednesday, April 28, 2004 12:27Subject: [SQL] select distinct and order byHello everybody,
I have a short question:
I'm trying to run the following query:
select distinct on (staff_id) staff_id, fullname, loginname from staff
where staff_id in
(select staff_id from staffmembership where staffgroup_id=#SomeIdValue#)
order by fullname
I get the follwing error:
select distinct on expressions must match the initial order by expression
Does this mean that I can only order by the same fields as the ones that I use in the distinct?
If so, is there still a way that I can select distinct on the keyfield, and still sort by the name. However unlikely, it could happen that two people have the same name, so a distinct on fullname could make problems.
The facts:
- PostgreSQL 7.3.2 running on RH 9
- pgODBC 7.3.0200
- Borland Delphi 7 enterprise
Regards,
Stijn Vanroye
-=[Today I got more responsabilities from my boss, as from now I'm responsible for everything that goes wrong ...]=-
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