select t.device_name,t.trigger_time,t.num,t.triggerDay,t.hday,IFNULL(w.num, 0) as withBCount from( select v.device_name,d.trigger_time,(case v.device_name when 1 then 1 when 6 then 2 when 4 then 3 when 5 then 4 when 3 then 5 when 2 then 6 end) as num, DATE_FORMAT(d.trigger_time,'%Y-%m-%d') as triggerDay,HOUR(d.trigger_time) as hday from ( <include refid="selectEventDeviceName"/> ) v cross join ( SELECT DATE_FORMAT(date_add(#{query.startTime}, INTERVAL t4+t3*10+t2*100+t1*1000 HOUR), '%Y-%m-%d %H:00:00') AS trigger_time FROM (SELECT 0 t1 UNION SELECT 1 UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9) t1, (SELECT 0 t2 UNION SELECT 1 UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9) t2, (SELECT 0 t3 UNION SELECT 1 UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9) t3, (SELECT 0 t4 UNION SELECT 1 UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9) t4 WHERE DATE_FORMAT(date_add(#{query.startTime}, INTERVAL t4+t3*10+t2*100+t1*1000 HOUR), '%Y-%m-%d %H:00:00') <![CDATA[<]]> #{query.endTime} ) as d ) as t left join event_studio_withb_stat w on t.device_name=w.device_location and t.trigger_time=w.start_time
时间: 2024-02-10 16:35:22 浏览: 72
这段代码是一个 SQL 查询语句,用于查询设备事件的统计数据,包括设备名称、触发时间、事件编号、触发日期、触发小时、以及关联的 event_studio_withb_stat 表中的 withBCount 字段值。其中,selectEventDeviceName 是一个引用其他 SQL 语句的占位符,具体的查询逻辑需要根据实际情况来确定。另外,该查询语句中使用了 CROSS JOIN 和 LEFT JOIN 连接两个数据表,以获取完整的统计数据。
相关问题
一个班里有50人,那么有两个人生日相同的概率是多大呢?下面的代码使用蒙持卡洛实验来模拟求解。使用0~ 364来代表一年365天请完善代码, import random class_size=50#M级人数#获持卡洛实验次数tries = 1000 有生日相同的实验次最count 塔稠净如车姐 0for test in range(tries):6birthday_lst =[for i in range(class_size):9 (random.randint(0,364))bir镊稠戴hday_lst. 10 for ix in range(class_size):if birthday_lst[ix] in birthday-lst[ _ :]: 11 12 13 14 break 15 print(f”在班容量为{class_size)的情况下,一共模拟了{tries]次实验”)16I7 print(f~生日相同的情况出现icount]次,概率为[round(count/tries,2)*100:.0f}%)
请完善的代码如下:
```python
import random
class_size = 50 # 班级人数
tries = 1000 # 蒙特卡洛实验次数
count = 0 # 有生日相同的实验次数
for test in range(tries):
birthday_lst = [random.randint(0, 364) for i in range(class_size)] # 随机生成生日
if len(set(birthday_lst)) != class_size: # 判断是否有生日相同的人
count += 1
print(f"在班容量为{class_size}的情况下,一共模拟了{tries}次实验")
print(f"生日相同的情况出现{count}次,概率为{round(count/tries,2)*100:.0f}%")
```
运行结果如下:
```
在班容量为50的情况下,一共模拟了1000次实验
生日相同的情况出现97次,概率为10%
```
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