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   SELECT
             DATE_FORMAT(DATE_SUB(concat((select month from ads_update_month where type = 3),'-01'), INTERVAL n MONTH), '%Y%m') AS x1
         FROM
             (SELECT 0 AS n UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3
              UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7
              UNION ALL SELECT 8 UNION ALL SELECT 9 UNION ALL SELECT 10 UNION ALL SELECT 11) AS numbers