SELECT 'Percent: 'col, ROUND(((SELECT COUNT(id) FROM content WHERE content IS NOT NULL)  * 100)::numeric / (SELECT COUNT(id) FROM content), 2) AS qty UNION
SELECT 'Already' col, (SELECT COUNT(id) FROM content WHERE content IS NOT NULL) qty UNION
SELECT 'Nope' col, (SELECT COUNT(id) FROM content WHERE content IS  NULL)  qty UNION
SELECT 'Nope firms' col, (SELECT COUNT(id) FROM content WHERE content IS  NULL AND url ~ '^.*/[0-9]')  qty UNION
SELECT 'Total' col, (SELECT COUNT(id) FROM content) AS qty UNION
SELECT 'Had mails' col, COUNT(id) qty FROM content WHERE url ~ '^.*/[0-9]' AND content LIKE '%<a href="mailto:%' UNION
SELECT 'Firms' col, COUNT(id) qty FROM content WHERE url ~ '^.*/[0-9]'
ORDER BY qty