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SELECT  stat_day, obs_day, stat_week, obs_week, NULL AS stat_cputotal,
+  
        stat_memfree, stat_md5, stat_month, obs_month, stat_type,     
+  
...
             obs_epoch, obs_hour, obs_idx, obs_month, obs_qtr, obs_wee
+k,
             serial_num, stat_md5
))

SELECT  stat_qtr, obs_qtr, stat_qtr AS cus_qtr, stat_qtr AS crash_qtr,
        MIN(stat_memfree) AS stat_memfree
FROM (   
    <<<previous statement after it works>>> 
)

<<<previous statement after it works>>>
GROUP BY stat_qtr