$qr_mostviewed = "
(SELECT postid, thumb, titulo, texto FROM secao_literatura ORDER BY views DESC LIMIT 1)
UNION ALL
(SELECT postid, thumb, titulo, texto FROM secao_enciclopedia ORDER BY views DESC LIMIT 1)
UNION ALL
(SELECT postid, thumb, titulo, texto FROM secao_materias ORDER BY views DESC LIMIT 1)
UNION ALL
(SELECT postid, thumb, titulo, texto FROM secao_noticias ORDER BY views DESC LIMIT 1)
";