How many assets does each third party company supply? List the count and the company id.
SELECT count(*) ,  T1.company_id FROM Third_Party_Companies AS T1 JOIN Assets AS T2 ON T1.company_id  =  T2.supplier_company_id GROUP BY T1.company_id
Her üçüncü taraf şirket kaç varlık sağlar?Sayımı ve şirket kimliğini listeleyin.