Napište SQL, které vypíše takové uživatele, jež nemají v profilu vyplněno pole WebsiteUrl


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English Language and Usage Meta

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          ROUND (COUNT( COUNT(*) FROM Users)*100, 2) AS Procent_neaktiv_uživatelů
FROM Users u
LEFT JOIN Posts p ON = p.OwnerUserId
WHERE p.OwnerUserId IS NULL;

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