Re: Please help me write a query - Mailing list pgsql-general

The 10 and 11 hour interval are being skipped because I'm only interested in the transitions of state 1. State 1 only transitioned three times at now - 12, now - 9 and now - 8.

The table has both transitions in it because I frequently care about them both together.  I just don't in this case.

On Thu, May 27, 2010 at 12:36 PM, Justin Graf <justin@magwerks.com> wrote:

On 5/27/2010 9:45 AM, Nikolas Everett wrote:

Sorry.  Here is the setup:

CREATE TABLE test (id BIGSERIAL PRIMARY KEY, state1 INT NOT NULL, state2 INT NOT NULL, timestamp TIMESTAMP);

INSERT INTO test (state1, state2, timestamp) VALUES (1, 1, now() - interval '12 hours');

INSERT INTO test (state1, state2, timestamp) VALUES (1, 2, now() - interval '11 hours');

INSERT INTO test (state1, state2, timestamp) VALUES (1, 1, now() - interval '10 hours');

INSERT INTO test (state1, state2, timestamp) VALUES (2, 1, now() - interval '9 hours');

INSERT INTO test (state1, state2, timestamp) VALUES (1, 1, now() - interval '8 hours');

I want to write a query that spits out:

 state1 |         timestamp          

--------+----------------------------

      1 | now() - interval '12 hours'

      2 | now() - interval '9 hours'

      1 | now() - interval '8 hours'

Have a question what makes  these values different other than the timestamp???

1, 1, now() - interval '12 hours'

1, 1, now() - interval '10 hours'

The reason i ask, is because you show 1, 1, now() - interval '8 hours'  in the desired output.   What logic keeps the 8 hour and 12 hour but not the 10hour interval???

Its kinda hard to understand why the 10hour interval is being skipped???

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