ISBN File Matching
Sometimes a supplier gives you a list of ISBNs that you want to match against your Reading Lists to see what the coverage might be.
This article explores how you can use the
f_rl_isbn_link view to find the items you care about.
We have provided a pre-generated view which provides a mapping between all ISBNs and which item they appear in. It is assumed that you have already loaded the mapping data into a table within the Advanced MIS data warehouse. See the using custom datasets recipe
At its simplest you can run a query which uses another subquery to get your list of ISBN values to compare against. We use the
upper() function to make sure we are comparing similarly cased values.
SELECT item_url, importance from f_rl_isbn_link where upper(isbn) in ( select upper(isbn) from my_table_of_isbns )
If you want to create a result set which includes other columns from your custom data, then something like this would allow you to create a temporary table (the with part of this query) and then join on isbn. This allows more flexible approaches to comparing data in the two datasets. In this example we have added a custom table for a file which maps ISBNs to a URL for the ebook. Notice again, we make sure we are comparing the ISBNs with a consistent case. It doesn’t actually matter whether this is
lower() as long as it is consistent.
with my_isbns as ( select isbn, ebook_url from my_table_of_isbns ) select f_rl_isbn_link.item_url, f_rl_items.web_address, my_isbns.ebook_url, f_rl_isbn_link.importance, f_rl_isbn_link.isbn from f_rl_isbn_link, my_isbns, f_rl_items where upper(f_rl_isbn_link.isbn) = upper(my_isbns.isbn) and f_rl_items.item_url = f_rl_isbn_link.item_url
We assume you know that some ISBNs may appear as both ISBN-10 or ISBN-13 variants. Talis Aspire does not enforce the use of one over another, so you should expect to check for both ISBN formats to get a true picture of which items match.
We typically see both upper and lower cased check-digits in ISBNs in different datasets. We always need to account for these possible data discrepancies when doing a comparison.
Taking it Further
Now you know which items associate with which ISBNs you can use this information to feed a bulk update script which uses Talis Aspire APIs to update the items with a new URL or change other metadata details. For example the first three columns of the second query returns the item id and the old and new URL which could be used with tool that has been developed in the developer community. To learn more, see this article about the developer community