Php 查找具有静态最大日期和最小日期的每日会话的平均值
PHP5.X,MySQL 5.7.15 已获取按星期几分组的数据,以使用最大日期和最小日期提供每日使用会话的平均计数。在此场景中,“最大”和“最小”日期将应用于一周中的某一天,这会导致每种情况下的周数不同 生成这些结果的查询在下面定义为查询1。基本上,最后4列中的信息应该是静态的,我使用自连接实现了这一点,详细内容如下。在那个例子中,会话计数爆炸了,因为我只在开发环境中工作 那么出了什么问题,为什么Php 查找具有静态最大日期和最小日期的每日会话的平均值,php,mysql,self-join,Php,Mysql,Self Join,PHP5.X,MySQL 5.7.15 已获取按星期几分组的数据,以使用最大日期和最小日期提供每日使用会话的平均计数。在此场景中,“最大”和“最小”日期将应用于一周中的某一天,这会导致每种情况下的周数不同 生成这些结果的查询在下面定义为查询1。基本上,最后4列中的信息应该是静态的,我使用自连接实现了这一点,详细内容如下。在那个例子中,会话计数爆炸了,因为我只在开发环境中工作 那么出了什么问题,为什么 session_count | weekday | maxDate
session_count | weekday | maxDate |minDate | numOfDayDiff| numOfWeeks
'29' | 'Friday'|'2017-03-10 12:16:47'|'2016-08-12 12:31:28'| '210' | '30'
'26' |'Monday' |'2017-03-06 17:10:59'|'2016-08-08 14:31:16'| '210' | '30'
'6' |'Saturday'|'2017-03-04 23:26:12'|'2016-08-20 23:10:47'| '196' | '28'
'10' |'Sunday' |'2017-03-12 18:28:51'|'2016-08-14 16:26:30'| '210' | '30'
'22' |'Thursday'|'2017-03-09 15:45:27'|'2016-06-30 12:42:19'| '252' | '36'
'22' |'Tuesday'|'2017-03-21 15:00:08'|'2016-06-28 19:51:21'| '266' | '38'
'22' |'Wednesday'|'2017-03-01 23:57:34'|'2016-07-06 16:17:39'| '238' | '34'
我希望最大日期和最小日期是静态的。我试着用w3schools来解释
我尝试应用此查询,maxDate、minDate、numDaysDiff和numOfWeeks与上述最高周数的值一致,但是会话计数的统计数据爆炸了
下面是获得上表的查询1:
SELECT
CEIL(COUNT(ss.session_id) / (FLOOR (DATEDIFF(MAX(ss.date),MIN(ss.date))/7))) as session_count,
DAYNAME((ss.date)) as weekday,
MAX(ss.date) as maxDate,
MIN(ss.date) as minDate,
DATEDIFF(MAX(ss.date),MIN(ss.date)) as numOfDayDiff,
FLOOR(DATEDIFF(MAX(ss.date),MIN(ss.date))/7) as numOfWeeks
FROM session ss
JOIN user u ON ss.user = u.id
JOIN account a on u.account = a.id
WHERE a.isTest=false
GROUP BY weekday
ORDER BY weekday;
下面是使用输出表后面的自连接语法修改的Q-2:
SELECT
CEIL(COUNT(ss.session_id) / (FLOOR (DATEDIFF(MAX(xx.date),MIN(xx.date))/7))) as session_count,
DAYNAME((ss.date)) as weekday,
MAX(xx.date) as maxDate,
MIN(xx.date) as minDate,
DATEDIFF(MAX(xx.date),MIN(xx.date)) as numOfDayDiff,
FLOOR(DATEDIFF(MAX(xx.date),MIN(xx.date))/7) as numOfWeeks
FROM session xx, session ss
JOIN user u ON ss.user = u.id
JOIN account a on u.account = a.id
WHERE a.isTest=false
GROUP BY weekday
ORDER BY weekday;
结果如下:
session_count | weekday | maxDate |minDate | numOfDayDiff| numOfWeeks
99357 |Friday |2017-03-21 15:00:08 |2016-06-28 19:51:21 |266 |38
88062 |Monday |2017-03-21 15:00:08 |2016-06-28 19:51:21 |266 |38
16829 |Saturday |2017-03-21 15:00:08 |2016-06-28 19:51:21 |266 |38
32505 |Sunday |2017-03-21 15:00:08 |2016-06-28 19:51:21 |266 |38
90136 |Thursday |2017-03-21 15:00:08 |2016-06-28 19:51:21 |266 |38
94516 |Tuesday |2017-03-21 15:00:08 |2016-06-28 19:51:21 |266 |38
83451 |Wednesday|2017-03-21 15:00:08 |2016-06-28 19:51:21 |266 |38
有谁能告诉我我是怎么出错的吗?我将看看是否可以创建一个mysql fiddle作为示例附加在这里。为了避免数据库压力,我决定使用一个修改版的Query 1,并使用结果确定哪个具有最多的周数,并将计数除以php中的周数 以下是修改后的查询1
SELECT
COUNT(ss.session_id) as session_count,
DAYNAME((ss.date)) as weekday,
MAX(ss.date) as maxDate,
MIN(ss.date) as minDate,
CEIL(DATEDIFF(MAX(ss.date),MIN(ss.date))/7) as numOfWeeks
FROM session ss
JOIN user u ON ss.user = u.id
JOIN account a on u.account = a.id
WHERE a.isTest=false
GROUP BY weekday
ORDER BY weekday;
session_count | weekday | maxDate | minDate | numOfWeeks
2017 | Friday |2017-03-17 23:39:56 |2016-09-09 01:06:36| 27
1908 | Monday |2017-03-20 23:59:53 |2016-09-12 14:52:29| 27
943 | Saturday|2017-03-18 23:39:14 |2016-09-17 14:49:56| 26
825 | Sunday |2017-03-19 23:56:37 |2016-09-18 22:28:45| 26
2429 | Thursday|2017-03-16 23:51:23 |2016-09-08 12:02:54| 27
2341 | Tuesday |2017-03-21 23:52:20 |2016-09-06 12:06:39| 28
2569 |Wednesday|2017-03-22 17:03:16 |2016-09-07 02:43:10| 28
注意数据因数据库不同而不同
SELECT
COUNT(ss.session_id) as session_count,
DAYNAME((ss.date)) as weekday,
MAX(ss.date) as maxDate,
MIN(ss.date) as minDate,
CEIL(DATEDIFF(MAX(ss.date),MIN(ss.date))/7) as numOfWeeks
FROM session ss
JOIN user u ON ss.user = u.id
JOIN account a on u.account = a.id
WHERE a.isTest=false
GROUP BY weekday
ORDER BY weekday;
session_count | weekday | maxDate | minDate | numOfWeeks
2017 | Friday |2017-03-17 23:39:56 |2016-09-09 01:06:36| 27
1908 | Monday |2017-03-20 23:59:53 |2016-09-12 14:52:29| 27
943 | Saturday|2017-03-18 23:39:14 |2016-09-17 14:49:56| 26
825 | Sunday |2017-03-19 23:56:37 |2016-09-18 22:28:45| 26
2429 | Thursday|2017-03-16 23:51:23 |2016-09-08 12:02:54| 27
2341 | Tuesday |2017-03-21 23:52:20 |2016-09-06 12:06:39| 28
2569 |Wednesday|2017-03-22 17:03:16 |2016-09-07 02:43:10| 28