我正在尝试获取一个查询，该查询将返回一个结果集，其中读取总数在特定小时范围内（在working_hours表中定义），具体取决于日期的DAYOFTHEWEEK，结果看起来如此像：
working | nonworking | weekend | date | group_id
-----------------------------------------------------------------
50.3 | 30.8 | 0 | 2015-04-01 00:00 | 7
40.3 | 60.8 | 0 | 2015-04-01 00:00 | 8
50.3 | 30.8 | 0 | 2015-04-02 00:00 | 7
40.3 | 60.8 | 0 | 2015-04-02 00:00 | 8
工作和周末范围存储在working_hours的数据库中，隐含非工作时间范围（NOT BETWEEN基本上当天的其他范围）
表格如下：
读数表包含每小时读数，名为readings
group_id | reading | datestamp
------------------------------------------------------
7 | 30.8 | 2015-04-01 00:00
7 | 20.2 | 2015-04-01 01:00
7 | 11.2 | 2015-04-02 00:00
7 | 20.2 | 2015-04-02 01:00
8 | 26.2 | 2015-04-01 00:00
8 | 30.2 | 2015-04-01 01:00
8 | 26.2 | 2015-04-02 00:00
8 | 30.2 | 2015-04-02 01:00
小时范围存储在working_hours表中，日期列为DAYOFTHEWEEK格式（1 =星期日，2 =星期一等）：
group_id | day | range_start | range_end | range_type_id | day_type_id
------------------------------------------------------------------------------
7 | 5 | 08:00:00 | 15:59:00 | 1 | 1
7 | 6 | 00:00:00 | 05:59:00 | 1 | 2
7 | 6 | 06:00:00 | 23:59:00 | 2 | 2
7 | 1 | 00:00:00 | 22:59:00 | 2 | 4
7 | 1 | 23:00:00 | 23:59:00 | 1 | 4
日期类型位于working_hours_day_type表中，对我来说事情变得复杂，工作日和周末只有一个范围，但是开始/结束周末有两个范围（'开始周末'第一个范围是工作时间，第二个范围周末时间和“结束周末”第一个范围是周末时间，第二个范围工作时间。
id | type
------------------
1 | Weekday
2 | Start Weekend
3 | Weekend
4 | End Weekend
范围类型位于working_hours_range_type表中：
id | type
------------------
1 | Working
2 | Weekend
我的Mysql知识仅限于简单的SELECT，INSERT等以及JOIN的基础知识 - 我发现了HOUR(datestamp) BETWEEN 8 AND 14但不知道如何获取子查询使用WHERE datestamp BETWEEN '2015-04-01 00:00:00' AND '2015-04-02 23:59:00'在父查询中迭代，如果事实上它是如何完成的......
答案 0 :(得分：0)
我不清楚工作时间或非工作时间是什么，但是这有用吗？
SELECT
sum(CASE WHEN rtype.range_type_id = 1 THEN reading ELSE 0 END) AS working
sum(CASE WHEN rtype.range_type_id = 2 THEN reading ELSE 0 END) AS nonworking
CASE WHEN r1.daynum in (7,1) THEN 1 ELSE 0 END as weekend
date(datestamp) as date
r1.group_id
FROM
(SELECT
group_id,
reading,
time(datestamp) as rTime,
case when weekday(datestamp) = 0 THEN 2 #weekday() monday to working hours monday
when weekday(datestamp) = 1 THEN 3
when weekday(datestamp) = 2 THEN 4
when weekday(datestamp) = 3 THEN 5
when weekday(datestamp) = 4 THEN 6
when weekday(datestamp) = 5 THEN 7
when weekday(datestamp) = 6 THEN 1
else NULL
END CASE AS daynum
FROM readings) AS r1
LEFT JOIN working_hours w1
ON (r1.daynum = w1.day)
AND (r1.group_id = w1.group_id)
AND (r1.rTime BETWEEN w1.range_start AND w1.range_end)
LEFT JOIN working_hours_day_type dtype
ON w1.day_type_id = dtype.id
LEFT JOIN working_hours_range_type rtype
ON w1.range_type_id = rtype.id
GROUP BY
CASE WHEN daynum in (7,1) THEN 1 ELSE 0 END,
date(datestamp) as date,
r1.group_id