[Babase] male dispersal query
Karl O. Pinc
kop at meme.com
Thu May 20 16:12:44 EDT 2010
On 05/20/2010 03:01:00 PM, Niki Learn wrote:
>
> On 05/14/2010 02:53:27 PM, Niki Learn wrote:
> > Main point: I have encountered a similar problem (to the male
> > dispersal
> > query problem) when dealing with female sexual cycle data. We
> > recently
> > wanted to know about the time period spent lactating and then
> cycling
> > after
> > each birth. But each pid is linked to the cycle PRIOR to birth,
> not
> > the one
> > after it. I could not find a way to get babase to link to the
> cycle
> > for the
> > next pid (which is tricky anyway since a few females have pids that
> > are out
> > of order or where one is skipped) and ended up having to run
> separate
> > queries, then line them up in Excel and calculate the cycling time
> > after
> > sorting by pid.
>
> Does PREGS.Resume not do the trick?
>
> Niki: That's how I got one of the pieces. I couldn't get babase to
> output
> them altogether though.
> Niki: Maybe I need to know more SQL tricks? There aren't very many
> listed
> in our "SQL for babase" page, I'll tell ya that. I have gathered
> others off
> the internet from time to time as needed but I don't always know what
> can be
> done to look for.
The way to "put them together" is to use a self-join.
That's where the same table shows up twice in a single
query. So you can take 2 queries and "merge" them
into one.
http://databases.about.com/od/sql/a/selfjoin.htm
Karl <kop at meme.com>
Free Software: "You don't pay back, you pay forward."
-- Robert A. Heinlein
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