Re: Approach to Data Summary and Analysis

On Mon, 14 Apr 2014 15:22:13 -0700
Robert DiFalco <robert(dot)difalco(at)gmail(dot)com> wrote:

Hi Robert,

> But then I lose a bunch of data like the TIMESTAMPTZ of the call, answer,
> connection, etc. Btw, currently these tables never need to be UPDATEd. They
> are immutable in the current design.

Yes, but you wrote :

>Occasionally I will want to know things like "When was the last time a user
>answered a call" or "How many times has a user been called".

With your schema, you would have to query several tables each time. Queries will get messy in a hurry, updates and DDL changes too.

> And in the end I'm not sure how the
> proposal of one table and a state that is updatable changes the basic
> thrust of the question. For example, getting last call, last answered,
> total called, total answered. If the state of a call transitions from
> called to answered then making it a field loses all the data with the
> previous state, make sense?
>

If you need this, you can use a schema that accommodates it.

(off the top of my head, insert a new record instead of altering an existing one, and create a hierarchy with parent records that point to an original call, may be with a 'parent' field and recursive queries. You probably have many requirements that I'm not aware of, but this one can be met)

--
Salutations, Vincent Veyron

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