From: | <operationsengineer1(at)yahoo(dot)com> |
---|---|
To: | "pgsql-novice(at)postgresql(dot)org" <pgsql-novice(at)postgresql(dot)org> |
Subject: | SQL Count Magic Required.... |
Date: | 2006-05-31 23:32:43 |
Message-ID: | 20060531233243.34255.qmail@web33307.mail.mud.yahoo.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-novice |
i have the following query that yields a series of
true or false results:
-- distinct on is pgsql extension --
SELECT DISTINCT ON (t_inspect_result.inspect_id)
t_inspect_result.inspect_result_id,
t_inspect_result.inspect_result_pass,
t_inspect_area.inspect_area,
t_inspect_result.inspect_result_timestamp
--,t_inspect.serial_number_id,
t_inspect.inspect_id
FROM t_inspect_result, t_inspect, t_inspect_area,
t_serial_number,
t_link_contract_number_job_number, t_job_number,
t_product
WHERE t_inspect.inspect_area_id =
t_inspect_area.inspect_area_id
AND t_inspect.serial_number_id =
t_serial_number.serial_number_id
AND t_serial_number.link_contract_number_job_number_id
=
t_link_contract_number_job_number.link_contract_number_job_number_id
AND t_link_contract_number_job_number.job_number_id =
t_job_number.job_number_id
AND t_product.product_id =
t_job_number.product_id
AND t_inspect.inspect_id =
t_inspect_result.inspect_id
AND t_inspect.serial_number_id = '200'
ORDER BY t_inspect_result.inspect_id DESC,
t_inspect_result.inspect_result_timestamp ASC
-- used to get first pass yield pass / fail (true /
false) data.
-- inspect_id desc impacts end result. time desc
impacts the groups prior to being distinctly listed
the simplified output may look like
f,t,t,f,f,f,t,f,t,f
the COUNT magic comes into play b/c i want to count
the result set's "t"s and total, but i have no clue
how to get this done.
#ts: 4
#total: 10
when i have this data, i can apply some math and come
up with a 40% yield.
any help is, as always, much appreciated.
tia...
ps - this query looks to be brutal when there is a lot
of data. is it? if so, how can i optimize it?
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
From | Date | Subject | |
---|---|---|---|
Next Message | Sean Davis | 2006-05-31 23:58:36 | Re: searching multiple tables |
Previous Message | Richard Broersma Jr | 2006-05-31 22:40:20 | Re: searching multiple tables |