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Calling the CTE for multiple inputs

From: air <mojaveranger7(at)gmail(dot)com>
To: pgsql-sql(at)postgresql(dot)org
Subject: Calling the CTE for multiple inputs
Date: 2012-10-04 19:31:49
Message-ID: 1349379109760-5726661.post@n5.nabble.com (view raw or flat)
Thread:
Lists: pgsql-sql
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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