[Koha] SQL report to search for series statements and volume numbers

[Michael Kuhn]

Hi

Our library is using Debian GNU/Linux 10 and Koha 20.11.

We are trying to extract the series statement (MARC 490$a) and volume 
numbers (MARC 490$v) from the MARCXML data. Some title data records more 
than one MARC 490 entry. We came up with the following SQL statement:

SELECT biblionumber,
ExtractValue(metadata,'//datafield[@tag="490"]/subfield[@code="a"]'),
ExtractValue(metadata,'//datafield[@tag="490"]/subfield[@code="v"]')
FROM biblio_metadata
WHERE 
ExtractValue(metadata,'//datafield[@tag="490"]/subfield[@code="a"]') = 
<<Series statement>>
ORDER BY 
ExtractValue(metadata,'//datafield[@tag="490"]/subfield[@code="v"]')

This will only find and sort the records that have just one and only one 
MARC 490 entry. Even if the given series statement is in the first MARC 
490 entry the record will not show up if the same record has a second 
MARC 490 entry.

We then changed the SQL statement to:

SELECT biblionumber,
ExtractValue(metadata,'//datafield[@tag="490"][1]/subfield[@code="a"]'),
ExtractValue(metadata,'//datafield[@tag="490"][1]/subfield[@code="v"]')
FROM biblio_metadata
WHERE 
ExtractValue(metadata,'//datafield[@tag="490"][1]/subfield[@code="a"]') 
= <<Series statement>>
ORDER BY 
ExtractValue(metadata,'//datafield[@tag="490"][1]/subfield[@code="v"]')

At least this will find all records that have the given series statement 
in the first MARC 490 entry. But it will (of course) not show or sort 
the records that have the given series statement in the second, third, 
etc MARC 490 entry.

According to 
https://wiki.koha-community.org/wiki/SQL_Reports_Library#Query_MARC I 
understand that ExtractValue concatenates multiple tags into a single 
field but unfortunately I couldn't come up with a solution to our problem...

Using column "seriestitle" from table "biblio" doesn't help because it 
behaves the same and there is no possibility to search for the volume 
number of the series (MARC 490$v).

Can anyone please help us out?

Best wishes: Michael Kuhn
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