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

[Roger Grossmann]

Hi Michael,

an inefficient and quite long running SQL statement for your request might be the following:

SELECT 
    s.ser AS series,
    s.vol AS volume,
    s.biblionumber
FROM 
    (
    SELECT 
        ExtractValue(a.metadata,'//datafield[@tag="490"][1]/subfield[@code="a"]') AS ser,
        ExtractValue(a.metadata,'//datafield[@tag="490"][1]/subfield[@code="v"]') AS vol,
        a.biblionumber
    FROM biblio_metadata a
    HAVING ser <> ''
    UNION ALL
    SELECT
        ExtractValue(a.metadata,'//datafield[@tag="490"][2]/subfield[@code="a"]') AS ser,
        ExtractValue(a.metadata,'//datafield[@tag="490"][2]/subfield[@code="v"]') AS vol,
        a.biblionumber
    FROM biblio_metadata a
    HAVING ser <> ''
    UNION ALL
    SELECT
        ExtractValue(a.metadata,'//datafield[@tag="490"][3]/subfield[@code="a"]') AS ser,
        ExtractValue(a.metadata,'//datafield[@tag="490"][3]/subfield[@code="v"]') AS vol,
        a.biblionumber
    FROM biblio_metadata a
    HAVING ser <> ''
    ) AS s
WHERE s.ser = <<Series statement>>
ORDER BY s.vol

Typically there are not many catalog records with more than 3 series.
If you expect more, you can add additional "UNION ALL" clauses with higher indexes.

The performance depends on the size of the collection. 
The statement runs slow due to the full table scans but if it is not a big collection the speed might be ok.

Best regards,
Roger

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> Am 08.04.2021 um 19:23 schrieb Michael Kuhn <mik at adminkuhn.ch>:
> 
> 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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