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SELECT /*+ use_hash(USERS POSTS) full(USERS) leading(USERS POSTS) */ ROUND(( (SELECT COUNT(*) Pocet_Uzivatelu FROM USERS u WHERE NOT EXISTS ( SELECT * FROM POSTS p WHERE u.id = p.OwnerUserId) ) *100 / COUNT(A.Id)), 2) Procenta_Uziv_BezPOST FROM USERS A