I'm looking, please, for some expertise in writing MySQL queries (Koha
"reports".) I have a good "report" for listing high value items in our
collections (a requirement for our insurers), but need to add the "special
case" of multi volume biblios.
Example: a set of Britannicas (14th ed.) is a single biblio with 24 "items"
at $25 each for a total of $600, above our declared insurance threshold (we
price items individually to cover incomplete sets.)
Question: How can I "SUM" all items under a single biblio in a manner that
will allow inclusion on the "HAVING" line below?
SELECT
items.price,biblio.author,biblio.title,ExtractValue(biblioitems.marcxml,
'//datafield[@tag="245"]/subfield[@code="b"]') AS subtitle FROM items
LEFT JOIN biblioitems on (items.biblioitemnumber=biblioitems.biblioitemnumber)
LEFT JOIN biblio on (biblioitems.biblionumber=biblio.biblionumber)
HAVING items.price >= <<Value more than>>
ORDER BY items.price DESC;
I *suspect* it's something along the lines of:
SET @price1=0;
SELECT items.price, (@price1:=SUM(items.price)) as FullValue, @price1 as
returned_val
but cannot get this to function properly (it returns the value of the whole
catalogue) -- the following:
SET @price1=0;
SELECT items.price, (@price1:=SUM(items.price)) as FullValue, @price1 as
returned_val,
biblio.author,biblio.title,ExtractValue(biblioitems.marcxml,
'//datafield[@tag="245"]/subfield[@code="b"]') AS subtitle FROM items
LEFT JOIN biblioitems on (items.biblioitemnumber=biblioitems.biblioitemnumber)
LEFT JOIN biblio on (biblioitems.biblionumber=biblio.biblionumber)
HAVING FullValue >= 500
ORDER BY FullValue DESC;
does *not* even save in Koha (Error 1 "see logs", but I can't find anything
- suspect it's the ; on line 1.) But on the command line, it runs without
syntactical error, but lists only biblionumber=1 and the total value of
everything we have ever catalogued ;={
Maybe it's not possible and a Perl script is required?
Many thanks for any suggestions.
Paul
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