Курс SQL - AVG по времени дня и дня недели

Question

У меня есть таблица с записями для каждого телефонного звонка. Я хочу создать матрицу, где у меня средняя скорость звонка за 30-минутный сегмент времени в течение дня по дням недели. Каждый вызов имеет время начала, которое дату/время

т.е.

Я хочу, чтобы отобразить пн-вс, как заголовки строк и 30 мин интервалами, как заголовки столбцов. Контент - это среднее количество вызовов за каждый день (Пн-Вс) в каждом конкретном 30-минутном сегменте. Это то, что я получил, но это не то, что я хочу. Он суммирует количество вызовов по временному сегменту, и я не могу определить, как получить средние значения.

Я надеюсь, что некоторые из них могут мне точку в правильном направлении -

SQL не то, что я часто использую так нежна :-)

set dateformat dmy 
SET DATEFIRST 1 -- Start with Monday 
SELECT datepart(dw,starttime) as 'Day', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS 'Midnight-12:30am', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '12:30am-1am', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS '1am-1:30am', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '1:30am-2am', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS '2am-2:30am', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '2:30am-3am', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS '3am-3:30am', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '3:30am-4am', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS '4am-4:30am', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '4:30am-5am', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS '5am-5:30am', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '5:30am-6am', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS '6am-6:30am', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '6:30am-7am', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS '7am-7:30am', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '7:30am-8am', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '8:30am-9am', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS '9am-9:30am', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '10:30am-11am', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS '11am-11:30am', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '11:30am-Noon', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS 'Noon-12:30pm', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '1pm-1:30pm', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS '1:30pm-2pm', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '2pm-2:30pm', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS '2:30pm-3pm', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '3pm-3:30pm', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS '4:30pm-4pm', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '4pm-5:30pm', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS '5:30pm-6pm', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '6pm-6:30pm', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS '6:30pm-7pm', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '7pm-7:30pm', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS '7:30pm-8pm', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '8pm-8:30pm', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS '8:30pm-9pm', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '9pm-9:30pm', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS '9:30pm-10pm', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '10pm-10:30pm', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS '10:30pm-11pm', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) > 30) THEN 1 ELSE 0 END) AS '11pm-11:30pm', 
SUM(CASE WHEN (DATEPART(hour,StartTime) = 7 and DATEPART(Minute,StartTime) <= 30) THEN 1 ELSE 0 END) AS '11:30pm-Midnight' 

FROM [dbo].[CallList] 
where StartTime>'1/6/2015' 
     and StartTime<'30/6/2015' 
GROUP BY datepart(dw,starttime) 
ORDER BY datepart(dw,starttime) 

Answer 1

Создание WHILE петли для вставки в временную таблицу, то делая агрегацию после того, как этот факт является жизнеспособным вариантом. Смотри ниже:

CREATE TABLE #Data 
(
    ID UNIQUEIDENTIFIER 
    ,DateIn DATETIME 
) 

INSERT INTO #Data 
VALUES 
(NEWID(), '2016-05-17 00:01:00'), 
(NEWID(), '2016-05-17 00:21:00'), 
(NEWID(), '2016-05-17 01:01:00'), 
(NEWID(), '2016-05-17 05:41:00'), 
(NEWID(), '2016-05-17 06:51:00'), 
(NEWID(), '2016-05-17 13:21:00'), 
(NEWID(), '2016-05-17 18:01:00'), 
(NEWID(), '2016-05-17 21:11:00'), 
(NEWID(), '2016-05-17 23:41:00'), 
(NEWID(), '2016-05-17 23:51:00') 


DECLARE @Start DATETIME 
DECLARE @End DATETIME 

SET @Start = '2016-05-17 00:00:00' 
SET @End = '2016-05-17 00:30:00' 

CREATE TABLE #Temp 
(
    ID UNIQUEIDENTIFIER 
    ,[Time Increment] VARCHAR(100) 
) 

WHILE @End <= '2016-05-17 23:30:00' 
    BEGIN 
    INSERT INTO #Temp 
    SELECT 
    ID 
    ,CAST(@Start AS VARCHAR) + ' - ' + CAST(@End AS VARCHAR) [Time Increment] 
    FROM #Data 
    WHERE DateIn >= @Start 
    AND DateIn < @End 

    SET @Start = DATEADD(Minute, 30, @Start) 
    SET @End = DATEADD(Minute, 30, @End) 
    END 

SELECT 
[Time Increment] 
,COUNT(ID) [Count] 
FROM #Temp 
GROUP BY [Time Increment] 

DROP TABLE #Temp 
DROP TABLE #Data 

В этом примере результат заключается в следующем:

Time Increment       |Count 
May 17 2016 1:00AM - May 17 2016 1:30AM | 1 
May 17 2016 1:00PM - May 17 2016 1:30PM | 1 
May 17 2016 5:30AM - May 17 2016 6:00AM | 1 
May 17 2016 6:00PM - May 17 2016 6:30PM | 1 
May 17 2016 6:30AM - May 17 2016 7:00AM | 1 
May 17 2016 9:00PM - May 17 2016 9:30PM | 1 
May 17 2016 12:00AM - May 17 2016 12:30AM | 2