Estimates on Wikidata number of statements, items, properties and mapping to triples

Question

I'm coming over from other knowledge bases to Wikidata. I have some questions on the terminology and size of Wikidata.

1. An RDF Triple contains a Subject, Relation, Object. Is there a one-to-one definition mapping to a Wikidata Statement containing an Item, Property, and Value ? I'm following the description of its data structure.
2. Is there a definitive page showing how many statements, unique items, and unique properties it contains? I've only found this Wikidata page which states there are about 87M items.

Answer 1

For (1), have a look at https://www.mediawiki.org/wiki/Wikibase/DataModel/Primer and https://www.mediawiki.org/wiki/Wikibase/Indexing/RDF_Dump_Format. A Statement is potentially much more than just subject, predicate, object, so the mapping is more complex, and many triples may be needed to describe a single statement.

For (2), there are public Graphana dashboards providing detailed analytics. However, there are too many dashboards with too many details, it seems https://grafana.wikimedia.org/dashboards/f/k0zbgDsik/wikidata-dashboards. For statements, I found https://grafana.wikimedia.org/d/000000175/wikidata-datamodel-statements?orgId=1&refresh=30m which sais that there are 1.1 billion statements on Wikidata. For Items and Properties (collectively called "entities"), I found https://grafana.wikimedia.org/d/000000167/wikidata-datamodel?orgId=1&refresh=30m, which tells me that there are about 87 million Items and about 7500 unique Properties.