MySQL的 - 使用DAYOFWEEK

Question

我想獲得一個查詢，將返回與某一時刻的範圍內讀取總（在working_hours表中定義）的結果集的具體日期小時範圍內的行取決於DAYOFTHEWEEK與一個日期結果，看起來像：

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 

工作和週末範圍存儲在數據庫中working_hours，非工作時間範圍是隱含的（當天基本上NOT BETWEEN其它範圍）

的表格如下：

讀數表有每小時讀數，命名爲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 

小時〜存儲在working_hours表，天塔是DAYOFTHEWEEK格式（1 =週日，2 =週一等）：

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 

表類型在working_hours_day_type表中，對於我來說事情變得複雜，平日和週末只有一個範圍，但開始/結束週末有兩個範圍（'開始週末'的第一個範圍是工作時間，第二個範圍的週末時間和'結束週末'第一個RA nge是週末時間，第二個工作時間範圍）。

id | type 
------------------ 
1 | Weekday 
2 | Start Weekend 
3 | Weekend 
4 | End Weekend  

範圍類型在working_hours_range_type表：

id | type 
------------------ 
1 | Working 
2 | Weekend 

我的MySQL的知識僅限於簡單SELECT，INSERT等和JOIN S中的基礎 - 我已經發現了約HOUR(datestamp) BETWEEN 8 AND 14但不知道如何讓子查詢使用WHERE datestamp BETWEEN '2015-04-01 00:00:00' AND '2015-04-02 23:59:00'母查詢中遍歷如果事實上那它怎麼做...

Answer 1

我不是什麼構成完全清楚工作時間或非工作時間，但這是否工作？

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