= enwiki-latest-category.sql
https://dumps.wikimedia.org/enwiki/latest/enwiki-latest-category.sql.gz contains a list of categories. It only contains the categories and some counts, but it doesn't contain the subcategories and pages under each category, so it is a bit pointless.
The schema is listed at: https://www.mediawiki.org/wiki/Manual:Category_table
The SQL first defines the table:
``
CREATE TABLE `category` (
`cat_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`cat_title` varbinary(255) NOT NULL DEFAULT '',
`cat_pages` int(11) NOT NULL DEFAULT 0,
`cat_subcats` int(11) NOT NULL DEFAULT 0,
`cat_files` int(11) NOT NULL DEFAULT 0,
PRIMARY KEY (`cat_id`),
UNIQUE KEY `cat_title` (`cat_title`),
KEY `cat_pages` (`cat_pages`)
) ENGINE=InnoDB AUTO_INCREMENT=249228235 DEFAULT CHARSET=binary ROW_FORMAT=COMPRESSED;
``
followed by a few humongous inserts:
``
INSERT INTO `category` VALUES (2,'Unprintworthy_redirects',1597224,20,0),(3,'Computer_storage_devices',88,11,0)
``
which we can see at: https://en.wikipedia.org/wiki/Category:Computer_storage_devices
Se see that https://en.wikipedia.org/wiki/Category:Computer_storage_devices_by_company
* https://en.wikipedia.org/wiki/Category:Computer_storage_devices is a subcategory of that category and it appears in that file.
* https://en.wikipedia.org/wiki/Acronis_Secure_Zone is a page of the category, and it does not appear
so it contains only categories.
We can check this with:
``
sed -s 's/),/\n/g' enwiki-latest-category.sql | grep Computer_storage_devices
``
and it shows:
``
(3,'Computer_storage_devices',88,11,0
(521773,'Computer_storage_devices_by_company',6,6,0
``
There doesn't seem to be any interlink between the categories, only page and subcategory counts therefore.