Re: Please help me write a query

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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