[Koha-devel] Active borrowers report

[Mike Hafen]

And now that I've actually tried that query, there are problems with it.
Here is a fixed version:

SELECT YEAR(issuedate), MONTH(issuedate), categorycode, COUNT(DISTINCT
borrowernumber)
FROM (
  SELECT issuedate, borrowernumber FROM old_issues
 UNION ALL
  SELECT issuedate, borrowernumber FROM issues
) AS all_issues
LEFT JOIN borrowers USING (borrowernumber)
GROUP BY YEAR(issuedate), MONTH(issuedate), categorycode

On Mon, Jan 9, 2012 at 1:31 PM, Galen Charlton <gmc at esilibrary.com> wrote:

> Hi,
>
>
> On 01/09/2012 03:30 PM, Mike Hafen wrote:
>
>> I've seen UNION used to join those two tables in queries.  I'm
>> imaginning something like:
>>
>> SELECT YEAR(issuedate), MONTH(issuedate), categorycode, COUNT(DISTINCT
>> borrowernumber)
>> FROM (
>>   SELECT issuedate,categorycode,**borrowernumber FROM old_issues
>>  UNION ALL
>>   SELECT issuedate,categorycode,**borrowernumber FROM issues
>>  )
>> LEFT JOIN borrowers USING (borrowernumber)
>> GROUP BY YEAR(issuedate), MONTH(issuedate), categorycode;
>>
>
> A UNION ALL is indeed a valid way to do it.
>
> Regards,
>
> Galen
> --
> Galen Charlton
> Director of Support and Implementation
> Equinox Software, Inc. / The Open Source Experts
> email:  gmc at esilibrary.com
> direct: +1 770-709-5581
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> Supporting Koha and Evergreen: http://koha-community.org &
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