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SELECT 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

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edited feb 28

created feb 28 anonymous