Re: auto incrementing rows from query..
| From: | Alexey Borzov | Date: | Wed, 06 Dec 2000 08:09:55 +0000 |
| Subject: | Re: auto incrementing rows from query.. | ||
| References: | 1 | Groups: | php.db |
| Request: | Send a blank email to php-db+get-5038@lists.php.net to get a copy of this message | ||
Greetings, Chad!
At 06.12.2000, 11:00, you wrote:
CD> I'm trying to determine the percentile value of where a row lies in a
CD> query.. hard to explain, but I'll try.
CD> I do a select all of my table, sorting it by SCORE. I want to find the
CD> position of a certain row in that select all, get that row #, and then I can
CD> calculate the percentile fine by dividing that position into the total # of
CD> rows, then multiplying by 100.
CD> my code is like:
CD> $querysetup = "SELECT SCORE, PID from pictures where VOTES > 100 order by
CD> SCORE DESC";
Ugh. I don't think that I quite get you, but:
If you want to find "that row" by SCORE, then you should issue something like
SELECT COUNT(*) FROM pictures WHERE VOTES>100 AND
SCORE>$your_needed_SCORE
If you want to find "that row" by PID, then
SELECT COUNT(*) FROM pictures WHERE VOTES>100 AND SCORE>(SELECT SCORE
FROM pictures WHERE PID=$your_needed_PID)
Thus you get the number of rows before "that row"
Then issue
SELECT COUNT(*) FROM pictures WHERE VOTES>100
to get _total_ number of rows
then divide one by the other, multiply by 100 and you're all done. :]
I'm almost sure that can be done in a more elegant way, though...
--
Yours, Alexey V. Borzov, Webmaster of RDW