On Jun 28, 1:43 pm, "Bauhaus" <[EMAIL PROTECTED]> wrote:
> I have the following table Price:
>
> FuelID PriceDate Price
> LPG1/05/2007 0,2
> LPG13/05/2007 0,21
> SPS 2/05/2007 1,1
> SPS 15/05/2007 1,08
>
> And I have to make the following query:
>
> FuelID PriceDate_from Price
On 11/15/06, Luca Ferrari <[EMAIL PROTECTED]> wrote:
On Wednesday 15 November 2006 16:20 your cat, walking on the keyboard,
wrote:
> May be you could show the results you are getting and then make up some
> results that you would really like to get. I am not entirely clear what
> you are trying
On Wednesday 15 November 2006 16:20 your cat, walking on the keyboard, wrote:
> May be you could show the results you are getting and then make up some
> results that you would really like to get. I am not entirely clear what
> you are trying to achieve.
Lastly I found the solution, for the mome
> Hi all,
> I've got a problem tryng to define a view with a few joins, I'll appreciate
> if
> someone could drive me in the definition of such query.
> I've got a table roleSkill that contains a row for each skill belonging to a
> defined role and with the desired competence level for such ski
Hi all,
I've got a problem tryng to define a view with a few joins, I'll appreciate if
someone could drive me in the definition of such query.
I've got a table roleSkill that contains a row for each skill belonging to a
defined role and with the desired competence level for such skill in such
r
O Flavio Fonseca έγραψε στις Nov 5, 2004 :
> Hi,
>
> I am having a problem with a system I developed using php with postgres.
>
> Take a look at this:
>
> Welcome to psql 7.3.2, the PostgreSQL interactive terminal.
> NetAdmin=# delete from operador where oplogin = 'ff';
> ERROR: fk_historico
Hi,
I am having a problem with a system I developed using php with postgres.
Take a look at this:
Welcome to psql 7.3.2, the PostgreSQL interactive terminal.
NetAdmin=# delete from operador where oplogin = 'ff';
ERROR: fk_historicosessao_operador referential integrity violation - key in
oper
This is the solution I was looking for! 20 seconds to compile the whole
list.
Thanks everyone for your help, I very much appreciate it. Even though
this is kind of 'hackey' being that it's non-standard SQL, it keeps the
database from having to to 40,000 selects, as would have to do with any
corre
On Monday 02 June 2003 00:49, listrec wrote:
> How about:
>
> select max(transaction_id) from bank_account group by customer_id
>
And if you want the rest of the data in the rows:
SELECT b.*
FROM bank_account b
JOIN (
SELECT max(transaction_id) AS transaction_id
FROM bank_account
On Monday 02 June 2003 00:49, listrec wrote:
> How about:
>
> select max(transaction_id) from bank_account group by customer_id
>
And if you want the rest of the data in the rows:
SELECT b.*
FROM bank_account b
JOIN (
SELECT max(transaction_id) AS transaction_id
FROM bank_account
I am afraid, this looks even uglier then your second solution, but
should work, and be quicker...
-- You need this to avoid having to rescan the whole table for each
customerid every time and resort the results
create index customer_txstamp_idx on bank_account (customer_id, ts);
select ba.* fro
"Erik G. Burrows" <[EMAIL PROTECTED]> writes:
> I need to get the most recent transaction for each customer. I need only
> the transaction ID, but the entire row would be best.
If you don't mind a not-standard-SQL solution, the SELECT DISTINCT ON
construct is designed for this sort of thing. See
How about:
select max(transaction_id) from bank_account group by customer_id
Should work...
Detlef
-Ursprüngliche Nachricht-
Von: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Auftrag von Erik G. Burrows
Gesendet: Montag, 2. Juni 2003 07:30
An: [EMAIL PROTECTED]
Betreff: [SQL] SQL
> It seems to me this is a simple problem, but the solution eludes me.
>
> I have a table:
>
> bank_account (
> transaction_id int not null serial,
> customer_id int not null references customer(id),
> ts timestamp not null default now(),
> amount float not null,
> balance float not null
> I need to get the most recent transaction for each customer. I need only
> the transaction ID, but the entire row would be best.
>
Why don't you alter the customer table to hold the transaction ID of the most
recent transaction?
Some questions though:
Do you vacuum the database regularly?
It seems to me this is a simple problem, but the solution eludes me.
I have a table:
bank_account (
transaction_id int not null serial,
customer_id int not null references customer(id),
ts timestamp not null default now(),
amount float not null,
balance float not null,
primary key(tra
On Tue, Jul 09, 2002 at 10:36:17AM +0200, David BOURIAUD wrote:
> Field group | count of D | count of R | count of X.
if you want this that way, i suggest using subselects.
like:
select
distinct field_group,
(select count(*) from table t2 where t2.field_group = t1.field_group and
What is wrong with:
select field_group, sum( case when f1 = 'D' then cnt else 0 end) as
D_COUNT,
sum( case when f1 = 'R' then cnt else 0 end) as R_COUNT,
sum( case when f1 = 'X' then cnt else 0 end) as X_COUNT
from (select field_group, f1, count (*) as cnt from tab group by
field_group, f1) a
I would suggest something like
select sum(case when f1 = 'D' then 1 else 0 end) as D_COUNT,
sum(case when f1 = 'R' then 1 else 0 end) as R_COUNT,
sum(case when f1 = 'X' then 1 else 0 end) as X_COUNT
from tab
where f1 in ('D','R','X')
Not sure what the "field group" represents.
HTH,
Loyd
On Thu
>
> I've got a table in which there is a field that can have one amongst 3
> possible values : D, R, X. Is it possible to get in one query the count of
> this different values.Please, note that I don't want to have a querry like
> this :
> "select count (*) from tab group by f1;", cause i want
Hi the list !
I've got a table in which there is a field that can have one amongst 3
possible values : D, R, X. Is it possible to get in one query the count of
this different values.Please, note that I don't want to have a querry like
this :
"select count (*) from tab group by f1;", cause i wan
Hello:
I have a table with pluviometrical data
meteo (rain float, day date)
I want to select the the day of maximum value for each year.It should be
something like :
select max(rain),day from meteo group by date_part('year', day);
but it obiously doesn't work.
I thought of doing it with agg
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