# Topic on Talk:Quarry

## Where can I find a documentation/tutorial for wikidata database

3

Hi.

Where can I learn about these tables

wb_changes;

wb_changes_dispatch;

wb_changes_subscription;

wb_id_counters;

wb_items_per_site;

wb_property_info;

wb_terms;

wbc_entity_usage;

wbqc_constraints;

wbs_propertypairs;

wbt_item_terms;

wbt_property_terms;

wbt_term_in_lang;

wbt_text;

wbt_text_in_lang;

wbt_type;

For example, we have this category for MediaWiki Database tables. Thanks ^_^

See mw:Category:Wikibase schema but some of the tables are missing and even if there is a page for the database table, the table is often poorly documented.

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