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 SELECT IF ( system.last_seen = "2000-01-01", "unknown", ( IF ( system.last_seen < DATE(NOW() - INTERVAL 180 day), "180 Days or more", 
( IF ( system.last_seen < DATE(NOW() - INTERVAL 150 day), "150-180 days", ( IF ( system.last_seen < DATE(NOW() - INTERVAL 120 day), "120-150 days", 
( IF ( system.last_seen < DATE(NOW() - INTERVAL 90 day), "90-120 days", ( IF ( system.last_seen < DATE(NOW() - INTERVAL 60 day), "60-90 days", 
( IF ( system.last_seen < DATE(NOW() - INTERVAL 30 day), "30-60 days", "7-30 days" ) ) ) ) ) ) ) ) ) ) ) ) ) AS `my_name`, 
IF ( system.last_seen = "2000-01-01", "system.last_seen=", 
( IF ( system.last_seen < DATE(NOW() - INTERVAL 180 day), CONCAT("system.last_seen=<", DATE(NOW() - INTERVAL 180 day)), 
( IF ( system.last_seen < DATE(NOW() - INTERVAL 150 day), CONCAT("system.last_seen=>", DATE(NOW() - INTERVAL 180 day), "&system.last_seen=<", DATE(NOW() - INTERVAL 150 day)), 
( IF ( system.last_seen < DATE(NOW() - INTERVAL 120 day), CONCAT("system.last_seen=>", DATE(NOW() - INTERVAL 150 day), "&system.last_seen=<", DATE(NOW() - INTERVAL 120 day)), 
( IF ( system.last_seen < DATE(NOW() - INTERVAL 90 day), CONCAT("system.last_seen=>", DATE(NOW() - INTERVAL 120 day), "&system.last_seen=<", DATE(NOW() - INTERVAL 90 day)), 
( IF ( system.last_seen < DATE(NOW() - INTERVAL 60 day), CONCAT("system.last_seen=>", DATE(NOW() - INTERVAL 90 day), "&system.last_seen=<", DATE(NOW() - INTERVAL 60 day)), 
( IF ( system.last_seen < DATE(NOW() - INTERVAL 30 day), CONCAT("system.last_seen=>", DATE(NOW() - INTERVAL 60 day), "&system.last_seen=<", DATE(NOW() - INTERVAL 30 day)), CONCAT("system.last_seen=>", DATE(NOW() - INTERVAL 30 day), "&system.last_seen=<", DATE(NOW() - INTERVAL 7 day))) ) ) ) ) ) ) ) ) ) ) ) ) AS `my_description`, 
count(system.id) AS `count` FROM system WHERE @filter AND DATE(system.last_seen) < DATE(NOW() - INTERVAL 7 day) GROUP BY `my_name` ORDER BY system.last_seen;