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POFilter on window function according to hour
 

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    <p>I want to use two different (yet similar) window functions to calculate two values <code>SUM</code> and <code>COUNT</code> on <code>is_active over user_id+item</code>, only up to the time of the row - minus 1 hour. My intuition was use ROWS <code>UNBOUNDED PRECEDING</code> but that way I can't filter over the time</p> <pre><code>COUNT(1) OVER(PARTITION BY user_id, item ORDER BY req_time ROWS UNBOUNDED PRECEDING) SUM(is_active) OVER(PARTITION BY user-id, item ORDER BY req_time ROWS UNBOUNDED PRECEDING) </code></pre> <p>However, that doesn't take under consideration the '1 hour ago' interval factor</p> <p>Consider the following data:</p> <pre><code>user_id | req_time | item | is_active | --------+--------------------+-------------------+--- 1 | 2011-01-01 12:00:00| 1 | 0 | 1 | 2011-01-01 12:30:00| 1 | 1 | 1 | 2011-01-01 15:00:00| 1 | 1 | 1 | 2011-01-01 16:00:00| 1 | 0 | 1 | 2011-01-01 16:00:00| 2 | 0 | 1 | 2011-01-01 16:20:00| 2 | 1 | 2 | 2011-02-02 11:00:00| 1 | 1 | 2 | 2011-02-02 13:00:00| 1 | 0 | 1 | 2011-02-02 16:20:00| 1 | 0 | 1 | 2011-02-02 16:30:00| 2 | 0 | </code></pre> <p>I expect the following results: "value 1" is SUM(is_active) and "value 2" is COUNT(1):</p> <pre><code>user_id | req_time | item | value 1 | value 2 | --------+--------------------+-----------------+---------+ 1 | 2011-01-01 12:00:00| 1 | 0 | 0 | 1 | 2011-01-01 12:30:00| 1 | 0 | 0 | 1 | 2011-01-01 15:00:00| 1 | 1 | 2 | 1 | 2011-01-01 16:00:00| 1 | 2 | 3 | 1 | 2011-01-01 16:00:00| 2 | 0 | 0 | 1 | 2011-01-01 16:20:00| 2 | 0 | 0 | 2 | 2011-02-02 11:00:00| 1 | 0 | 0 | 2 | 2011-02-02 13:00:00| 1 | 1 | 1 | 1 | 2011-02-02 16:20:00| 1 | 2 | 4 | 1 | 2011-02-02 16:30:00| 2 | 1 | 2 | </code></pre> <p>I'm using Greenplum 4.21 which is based on Postgresql 8.2.15</p> <p>Thanks in advance! gilibi</p>
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    1. USIan R. O'Brien
    1. USgilibi
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    1. COPostgresql 8.2 does not have window functions. Did you try your query?
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      1. USClodoaldo Neto
    2. COPostgresql 8.2 doesn't have window function but Greenplum 4.2 does have them. The query that I added in the question runs perfectly, except for the '1 hour ago' condition
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      1. USgilibi
 

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