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Query: SELECT 5*FLOOR((YEAR(f.marrdatetr)-YEAR(p.birthdatetr))/5) AS married_age_from, 5*FLOOR((YEAR(f.marrdatetr)-YEAR(p.birthdatetr))/5)+4 AS married_age_till, COUNT(*) AS Total, RPAD('',COUNT(*)/50,'=') AS Graph FROM tng_people AS p LEFT JOIN tng_families AS f ON p.personID=f.wife WHERE p.birthdatetr>0 AND f.marrdatetr-p.birthdatetr>0 GROUP BY married_age_from ORDER BY married_age_from LIMIT 800

Lost connection to MySQL server during query