Hi Katrin
You wrote:
> if you use
>
> ExtractValue(metadata,'//datafield[@tag="490"]/subfield[@code="a"]') =
> <<Series statement>>
>
> and there are multiple 490$a, they will appear as one space separated
> string. That means, that you need to use LIKE and truncation with % to
> locate the ones with the entry you are looking for.
So rewriting my statement I tried the following:
SELECT biblionumber,
ExtractValue(metadata,'//datafield[@tag="490"]/subfield[@code="a"]'),
ExtractValue(metadata,'//datafield[@tag="490"]/subfield[@code="v"]')
FROM biblio_metadata
WHERE
ExtractValue(metadata,'//datafield[@tag="490"]/subfield[@code="a"]')
LIKE CONCAT ('%', <<Series statement>>, '%')
ORDER BY
ExtractValue(metadata,'//datafield[@tag="490"]/subfield[@code="v"]')
Now it will find all records - but as expected the sorting will not be
correct: If there is more than one series statement in the record it
will show all volume numbers of the different MARC 490 entries in one
line - but the correct number is not necessarily the first one.
> If you want to target the first, second, etc., you can use:
>
> ExtractValue(metadata,'//datafield[@tag="490"]/subfield[@code="a"][1]')
Yes, but it doesn't really help in this case (at least not with my
simple kind of statement) because the searched for series is not always
in the same position in the MARC 490 entries in all records... Luckily
Roger Grossmann came up with a great solution to circumvent this problem
(see the next posting in this thread).
Thanks anyway for the hint about the LIKE clause - here I learned how to
use it together with the << >> syntax.
Best wishes: Michael
--
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Admin Kuhn GmbH · Pappelstrasse 20 · 4123 Allschwil · Schweiz
T 0041 (0)61 261 55 61 · E [email protected] · W www.adminkuhn.ch
On 08.04.21 19:23, Michael Kuhn wrote:
Hi
Our library is using Debian GNU/Linux 10 and Koha 20.11.
We are trying to extract the series statement (MARC 490$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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