例子：某主機下有5149個設備，設備分不同類別，設備運行會有不同狀態（1-正常、2-告警、3-故障、0-離線）
sql：
SELECT t.DEVICE_TYPE_NAME,
SUM(CASE t.DEVICE_STATUS WHEN '1' THEN 1 ELSE 0 END) AS '正常',
SUM(CASE t.DEVICE_STATUS WHEN '3' THEN 1 ELSE 0 END) AS '故障',
SUM(CASE t.DEVICE_STATUS WHEN '0' THEN 1 ELSE 0 END) AS '離線',
SUM(CASE t.DEVICE_STATUS WHEN '2' THEN 1 ELSE 0 END) AS '告警'
FROM(SELECT * FROM `device_info` WHERE FIRE_SYSTEM_ID=1 and CATEGORY_ID=2 and DELETED=0 AND DIST_ID=5) t
GROUP BY t.DEVICE_TYPE_NAME
查詢結果：
頁面效果：
