[Koha] Report help needed

[Barton Chittenden]

Elaine,

This query should do what you're looking for:

select biblionumber, from biblioitems where ExtractValue( marcxml,
'//datafield[@tag=942]/subfield[@code="c"]' ) = '';

Depending on the number of bibs, this could take quite a while to run -- I
would try it after hours.

Alternatively, if you have 942$c mapped in your biblio-marc mappings, you
could try querying the filed that it's mapped to, which would look a bit
like this:

select biblionumber from biblioitems where FOO is NULL;

where FOO is the column in question (FOO could conceivably be in items or
biblio... adjust the query above accordingly). This would run much faster
than the ExtractValue query.

--Barton