Hi,
I have table users;
id name bin
--
1 xx 9
dec(1) dec(9) = dec(1)
bin(0001) bin(1001) = bin(0001)
This query is bad.
SELECT name FROM users WHERE id_user=1 AND (bin 1)
This query return
Warning: PostgreSQL query failed: ERROR: right- hand side of AND is
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 the
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.*
Rado Petrik wrote:
Hi,
I have table users;
id name bin
--
1 xx 9
dec(1) dec(9) = dec(1)
bin(0001) bin(1001) = bin(0001)
This query is bad.
SELECT name FROM users WHERE id_user=1 AND (bin 1)
This query return
Warning: PostgreSQL query failed: ERROR: right-
I have an ips table with 10+ records, each record having a
catid field representing its category. catid references a row in a
table called categories.
For statistics purpose (generation of images with the evolution of the
number of rows by category), I am trying to reduce the load on the
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
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
On Monday 02 Jun 2003 4:47 pm, Samuel Tardieu wrote:
I have an ips table with 10+ records, each record having a
catid field representing its category. catid references a row in a
table called categories.
For statistics purpose (generation of images with the evolution of the
number of
On 2/06, Richard Huxton wrote:
| You want to use triggers not rules here (see the server programming and
| procedural language manual sections). A trigger will be fired for each row
| inserted/deleted/updated. Of course this means it will be fired 5000 times
| for 5000 updated rows.
Ouch. At
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