Question

该表显示了车牌号，显示了相机的时间，位置。我需要找到每周出现不止一次的汽车，我需要知道他们是谁以及每周的显示频率，以及满足条件的汽车总数。

我试图手动分割时间段，但效率太低。我尝试了以下查询：

   SELECT *, 
       Variance(Time_to_sec(time)), 
       Count(*) 
   FROM   trafficdata.anpr_in 
   WHERE  location = 'a35.1.ob.1' 
       AND Date(time) BETWEEN '2012-05-09'AND '2012-05-15' 
       AND Time(time) BETWEEN '07:00:00' AND '07:05:00' 
   GROUP  BY plate 
   HAVING ( Count(plate) > 3 );

输入表如下所示：

  plate         location     number                    time
T971JUR     A3024.7.IB.1         96     2012-05-13 18:06:17
HN52YWE     A3024.13.OB.1        94     2012-05-13 18:09:53

Answer 1

如果你的表是

create table tickets (car_number varchar(10),date_of_offense date, 
camera_number varchar(10));

然后

select car_number from tickets group by week(date_of_offense ) having count(*)>1

会让你那些一周内冒犯过两次或更多次的汽车

Answer 2

当你说“我需要找到每周出现不止一次的汽车”时，你的意思是：一周内不止一次出现的汽车？或者，在此期间每周出现的汽车不止一次？

第一个可以回答为：

SELECT plate, week(time), count(*)
FROM   trafficdata.anpr_in 
WHERE  location = 'a35.1.ob.1' AND
       Date(time) BETWEEN'2012-05-09'AND '2012-05-15' AND
       Time(time) BETWEEN '07:00:00' AND '07:05:00' 
GROUP  BY plate , week(time)
HAVING count(*) > 1;

第二个可以回答为：

select plate
from (SELECT plate, week(time), count(*) as cnt
      FROM   trafficdata.anpr_in 
      WHERE  location = 'a35.1.ob.1' AND
             Date(time) BETWEEN'2012-05-09'AND '2012-05-15' AND
             Time(time) BETWEEN '07:00:00' AND '07:05:00' 
      GROUP  BY plate , week(time)
      HAVING count(*) > 1
     ) t
having min(plate) > 1;

怎么让计数出现在一周

2 个答案: