Re: Iterate and write a previous row to a temp table?

--- Bob Singleton <bsingleton@ibss.net> wrote:

> Revisiting a Time In Status query I received help on - I'm trying to 
> narrow down a subset of data I return for analysis.
> 
> Given a statusLog as entityId, statusId, timestamp that might look 
> something like
> 
> entityId | statusId | timestamp
> --------------------------------------------
> 001      | HLD      | 2007-06-14 11:07:35.93
> 001      | RDY      | 2007-06-15 11:07:35.93
> 001      | USE      | 2007-06-16 11:07:35.93
> 001      | RDY      | 2007-06-17 11:07:35.93
> 001      | MNT      | 2007-06-18 11:07:35.93
> 
> I need to pull for a given span of time - say 2007-06-16 00:00:00.01 
> (let me call it startTime)  to 2007-06-17 23:59:59.99 (call it
> endTime) 
> in such a way that rows with a timestamp between startTime and
> endTime 
> AND the latest record prior to or equal to startTime are returned. In
> 
> the above simplified example, only the second and third rows would be
> 
> returned.
> 
> A colleague suggested a temp table, but I'm unsure how to iterate
> until 
> I pass the startTime and then write the _previous_ and all subsequent
> 
> rows to a temp table, stopping when I pass the endTime parameter.
> 
> Any hints?
> 
> Thanks!
> Bob Singleton
> 

couldn't you use the simple query:

select * from sometable
where timestamp between (select max(timestamp) from sometable where timestamp <= minTime) and maxTime




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