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## 2020-06-23
Where do back ISSN-Ls come from? Answer: exiting fatcat metadata.
select count(*) from journal where valid_issnl = 0;
=> 4
select count(*) from journal where known_issnl = 0;
=> 2304
select directory.slug, count(*) from journal join directory on journal.issnl = directory.issnl where journal.known_issnl = 0 group by directory.slug order by count(*) desc limit 20;
select count(*) from journal join fatcat_container on journal.issnl = fatcat_container.issnl where journal.known_issnl = 0;
=> 2,328
=> note: still a few dupe ISSN-L in fatcat_container
How many journals might be longtail but have just a handful of DOIs? And would
be lost if we filter by `has_doi=0`?
select count(*) from journal where has_dois = 1 and release_count <= 10;
9054
select count(*) from journal where has_dois = 1 and is_longtail = 1;
15,575
select count(*) from journal where has_dois = 1 and (is_active is null or is_active = 1) and release_count <= 10 and any_homepage = 1;
=> 5,843
How many *journals* would old query turn up? NOTE: have not verified new homepage URLs
SELECT COUNT(DISTINCT journal.issnl), COUNT(DISTINCT homepage.url)
FROM homepage
LEFT JOIN journal ON homepage.issnl = journal.issnl
WHERE
homepage.terminal_status_code = 200
AND journal.is_longtail = 1
AND homepage.domain != 'archive.org'
AND homepage.host NOT LIKE '%scielo%'
AND homepage.domain != 'jst.go.jp'
AND homepage.host != 'books.google.com'
AND homepage.host != 'www.google.com'
AND journal.has_dois = 0;
=> 16,471 journals
=> 19,460 URLs
New tweaks:
SELECT COUNT(DISTINCT journal.issnl), COUNT(DISTINCT homepage.url)
FROM homepage
LEFT JOIN journal ON homepage.issnl = journal.issnl
WHERE
(homepage.terminal_status_code = 200 or homepage.blocked or homepage.terminal_status_code is null)
AND homepage.domain != 'archive.org'
AND homepage.host NOT LIKE '%scielo%'
AND homepage.domain != 'jst.go.jp'
AND homepage.host != 'books.google.com'
AND homepage.host != 'www.google.com'
AND homepage.domain != 'oclc.org'
AND homepage.host != 'www.ncbi.nlm.nih.gov'
AND homepage.domain != 'umi.com'
AND homepage.domain != 'doi.org'
AND homepage.host != 'www.thefreelibrary.com'
AND (journal.is_longtail = 1
OR journal.publisher_type = 'society'
OR journal.publisher_type = 'unipress'
OR journal.publisher_type IS NULL)
AND (journal.has_dois = 0 or journal.release_count < 20);
=> 57,637 journals
=> 70,770 homepages
This is a significant increase in size over previous crawls!
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