[mythtv-users] sql query to identify duplicates
Leo Butler
leo.butler at member.ams.org
Wed Apr 30 22:23:05 UTC 2014
> On 30/04/14 11:46 AM, Leo Butler wrote:
> >> From: "Michael T. Dean" <mtdean at thirdcontact.com>
> >> On 04/30/2014 09:47 AM, Leo Butler wrote:
> >> > Hi,
> >> >
> >> > Since changing over from an analogue (pvr-150) to digital (hdhr3-cc)
> >> > tuner, I have written a custom recording rule to re-record episodes.
> >> > I simply modified the custom rule to re-record sdtv recordings when
> >> > available as hdtv.
> >> >
> >> > I would like to write an sql query to identify duplicate recordings,
> >> > in order to delete the older recording. I am no sql guru, and my first
> >> > thought was to query the recorded.duplicate field--but this is set to
> >> > 1 for all recordings, so the name belies its purpose.
> >> >
> >> > Any suggestions?
> >>
> >> http://www.mythtv.org/wiki/FindDuplicateRecordings , but ideally you'd
> >> modify it so it operates on all recordings and so that things like
> >> category can be specified in the command line or interactively--and
> >> especially so that deletes are confirmed interactively. Lots of
> >> examples at http://www.mythtv.org/wiki/Category:Python_Scripts (those by
> >> Raymond Wagner being excellent examples of how to do things properly
> >> with the Python bindings he wrote :).
> >>
> >> This would be a much better "whole" solution than using SQL (which can't
> >> do the rest--like delete and such).
> >
> > Mike, thanks for the comments, but I am looking for an sql query.
> > I guess I'll need to rtfm.
> >
>
> Try something like this:
>
> SELECT field, COUNT(field) FROM table GROUP BY field HAVING
> (COUNT(field) > 1);
>
> for example ( querying the mysql database as root)
>
> select user, count(user) from user group by user having (count(user) > 1);
> +--------+-------------+
> | user | count(user) |
> +--------+-------------+
> | mythtv | 4 |
> +--------+-------------+
>
> ( Yes, the mysql database has a field called user, in a table called
> user!. And I have 4 entries for the mythtv user at localhost, 127.0.0.1
> etc)
Thanks, Geoff.
Leo
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