[SQL] Calling the CTE for multiple inputs
I have a CTE that takes top left and bottom right latitude/longitude values
along with a start and end date and it then calculates the amount of user
requests that came from those coordinates per hourly intervals between the
given start and end date. However, I want to execute this query for about
2600 seperate 4-tuples of lat/lon corner values instead of typing them in
one-by-one. How would I do that? The code is as below:
WITH cal AS (
SELECT generate_series('2011-02-02 00:00:00'::timestamp ,
'2012-04-01 05:00:00'::timestamp ,
'1 hour'::interval) AS stamp
),
qqq AS (
SELECT date_trunc('hour', calltime) AS stamp, count(*) AS zcount
FROM mytable
WHERE calltime >= '2011-02-13 11:59:11'
AND calltime <= '2012-02-13 22:02:21'
AND (calltime::time >= '11:59:11'
AND calltime::time <= '22:02:21')
AND ((extract(DOW from calltime) = 3) /*OR (extract(DOW from calltime) =
5)*/)
AND lat BETWEEN '40' AND '42'
AND lon BETWEEN '28' AND '30'
GROUP BY date_trunc('hour', calltime)
)
SELECT cal.stamp, COALESCE (qqq.zcount, 0) AS zcount
FROM cal
LEFT JOIN qqq ON cal.stamp = qqq.stamp
WHERE cal.stamp >= '2011-02-13 11:00:00'
AND cal.stamp <= '2012-02-13 22:02:21'
AND ((extract(DOW from cal.stamp) = 3) /*OR (extract(DOW from cal.stamp) =
5)*/)
AND (
extract ('hour' from cal.stamp) >= extract ('hour' from '2011-02-13
11:00:00'::timestamp) AND
extract ('hour' from cal.stamp) <= extract ('hour' from '2012-02-13
22:02:21'::timestamp)
)
ORDER BY stamp ASC;
And the sample output for the query above:
calltime zcount
"2011-02-16 11:00:00"0
"2011-02-16 12:00:00" 70
"2011-02-16 13:00:00" 175
"2011-02-16 14:00:00" 97
"2011-02-16 15:00:00" 167
.
.
.
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[SQL] String Search
Anyone know the best way to do one select in String field? tks -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
Re: [SQL] Calling the CTE for multiple inputs
> -Original Message- > From: pgsql-sql-ow...@postgresql.org [mailto:pgsql-sql- > ow...@postgresql.org] On Behalf Of air > Sent: Thursday, October 04, 2012 3:32 PM > To: pgsql-sql@postgresql.org > Subject: [SQL] Calling the CTE for multiple inputs > > I have a CTE that takes top left and bottom right latitude/longitude values > along with a start and end date and it then calculates the amount of user > requests that came from those coordinates per hourly intervals between the > given start and end date. However, I want to execute this query for about > 2600 seperate 4-tuples of lat/lon corner values instead of typing them in one- > by-one. How would I do that? The code is as below: > > AND lat BETWEEN '40' AND '42' > AND lon BETWEEN '28' AND '30' I don't really follow but if I understand correctly you want to generate 2600 distinct rows containing values like (40, 42, 28, 30)? You could use "generate_series()" to generate each individual number along with a row_number and then join them all together: SELECT lat_low, lat_high, long_low, long_high FROM (SELECT ROW_NUMBER() OVER () AS index, generate_series(...) AS lat_low) lat_low_rel NATURAL JOIN (SELECT ROW_NUMBER() OVER () AS index, generate_series(...) AS lat_high) lat_high_rel NATURAL JOIN (SELECT ROW_NUMBER() OVER () AS index, generate_series(...) AS long_low) long_low_rel NATURAL JOIN (SELECT ROW_NUMBER() OVER () AS index, generate_series(...) AS long_high) long_high_rel You may (probably will) need to move the generate_series into a FROM clause in the sub-query but the concept holds. Then in the main query you'd simply... AND lat BETWEEN lat_low AND lat_high AND lon BETWEEN long_low AND long_high HTH David J. -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
Re: [SQL] String Search
> -Original Message- > From: pgsql-sql-ow...@postgresql.org [mailto:pgsql-sql- > ow...@postgresql.org] On Behalf Of Fabio Ebner - Dna Solution > Sent: Thursday, October 04, 2012 3:41 PM > To: pgsql-sql@postgresql.org > Subject: [SQL] String Search > > Anyone know the best way to do one select in String field? > > tks You are going to need to phrase a better question. In the meantime please read the documentation on the various built-in string functions available. I've provided links to the function index page (look for "string functions") as well as PostgreSQL's full text search capability since both are "string" related. http://www.postgresql.org/docs/9.2/interactive/functions.html http://www.postgresql.org/docs/9.2/interactive/textsearch.html My best guess is you want to learn about substring functions and/or regular expressions. David J. -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
Re: [SQL] Calling the CTE for multiple inputs
On 10/05/2012 03:31 AM, air wrote:
I have a CTE that takes top left and bottom right latitude/longitude values
along with a start and end date and it then calculates the amount of user
requests that came from those coordinates per hourly intervals between the
given start and end date. However, I want to execute this query for about
2600 seperate 4-tuples of lat/lon corner values instead of typing them in
one-by-one. How would I do that? The code is as below:
Sometimes it's easiest to just wrap it in an SQL function.
CREATE OR REPLACE FUNCTION some_expr( lat_low IN integer, lat_high IN
integer, lon_low IN integer, lon_high IN integer, calltime OUT
timestamptz, zcount OUT integer) returns setof record as $$
-- ... query text here, using $1 through $4 to refer to parameters
$$ LANGUAGE 'SQL';
... then invoke with something like (untested, from memory):
SELECT (some_expr(lat_low, lat_high, lon_log, lon_high).*)
FROM table_containing_lat_lon_pairs;
Alternately you may be able to rephrase the `qqq` part as a `join` on a
table containing the lat/lon pairs and include those pairs in `qqq`'s
output as well as the rest. You then use those in the outer query where
required. Without a schema to test with and some understanding of what
the query does it's hard to say exactly.
Wrapping it in a function is likely to be less efficient, but probably
easier.
--
Craig Ringer
WITH cal AS (
SELECT generate_series('2011-02-02 00:00:00'::timestamp ,
'2012-04-01 05:00:00'::timestamp ,
'1 hour'::interval) AS stamp
),
qqq AS (
SELECT date_trunc('hour', calltime) AS stamp, count(*) AS zcount
FROM mytable
WHERE calltime >= '2011-02-13 11:59:11'
AND calltime <= '2012-02-13 22:02:21'
AND (calltime::time >= '11:59:11'
AND calltime::time <= '22:02:21')
AND ((extract(DOW from calltime) = 3) /*OR (extract(DOW from calltime) =
5)*/)
AND lat BETWEEN '40' AND '42'
AND lon BETWEEN '28' AND '30'
GROUP BY date_trunc('hour', calltime)
)
SELECT cal.stamp, COALESCE (qqq.zcount, 0) AS zcount
FROM cal
LEFT JOIN qqq ON cal.stamp = qqq.stamp
WHERE cal.stamp >= '2011-02-13 11:00:00'
AND cal.stamp <= '2012-02-13 22:02:21'
AND ((extract(DOW from cal.stamp) = 3) /*OR (extract(DOW from cal.stamp) =
5)*/)
AND (
extract ('hour' from cal.stamp) >= extract ('hour' from '2011-02-13
11:00:00'::timestamp) AND
extract ('hour' from cal.stamp) <= extract ('hour' from '2012-02-13
22:02:21'::timestamp)
)
ORDER BY stamp ASC;
And the sample output for the query above:
calltime zcount
"2011-02-16 11:00:00"0
"2011-02-16 12:00:00" 70
"2011-02-16 13:00:00" 175
"2011-02-16 14:00:00" 97
"2011-02-16 15:00:00" 167
.
.
.
--
View this message in context:
http://postgresql.1045698.n5.nabble.com/Calling-the-CTE-for-multiple-inputs-tp5726661.html
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