最近遇到一个需求，计算处理率，直接sql输出结果。

不废话，上sql：

SELECT concat(
TRUNCATE(
(
查询结果1/
查询结果2
 )
 * 100,2),'%'
) as rate
FROM 表名称
GROUP BY rate

SELECT concat(
TRUNCATE(
(
(SELECT count(*) FROM fire_alarm_event WHERE DATE_FORMAT( alarm_time, '%Y%m' ) = DATE_FORMAT( CURDATE( ) , '%Y%m' ) and is_deleted = 0 AND   alarm_state <> 1)/
(SELECT count(*) FROM fire_alarm_event WHERE DATE_FORMAT( alarm_time, '%Y%m' ) = DATE_FORMAT( CURDATE( ) , '%Y%m' ) and is_deleted = 0) 
 )
 * 100,2),'%'
) as rate
FROM fire_alarm_event
GROUP BY rate

结果：

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