Create table with each customer and each hour of the month - sql

Question

I have a list of customers that we can receive calls for each month. I generate a list with a simple
SELECT DISTINCT(Campaign)
FROM [Reporting].[dbo].[New_Five9_CallLog]
WHERE DATEDIFF(MM,TimeStamp,GETDATE()) <= 12
I also have short little recursion query I can use to create an entry for each hour of the current month
WITH time_CTE
AS (
SELECT DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()), 0) AS [DateTime]
UNION ALL
SELECT dateadd(hour, 1, [DateTime])
FROM time_CTE
WHERE dateadd(hour, 1, [DateTime]) < EOMONTH(GETDATE())
)
SELECT *
FROM time_CTE
OPTION (maxrecursion 0);
I also have a query that will show me the total calls received for each client, for each hour of the month
SELECT
DATEADD(hour, DATEDIFF(hour, 0,
DATEADD(minute, 30 - DATEPART(minute, Timestamp + '00:30:00.000'),
Timestamp)), 0) as RoundedToHour,
Campaign,
COUNT(*) AS Actual
FROM [Reporting].[dbo].[New_Five9_CallLog] WITH (NOLOCK)
WHERE DATEDIFF(mm, Timestamp, GETDATE()) = 1
AND Call_Type = 'Inbound'
GROUP BY Campaign,
DATEADD(hour, DATEDIFF(hour, 0,
DATEADD(minute, 30 - DATEPART(minute, Timestamp + '00:30:00.000'),
Timestamp)), 0)
My ultimate goal is to have a procedure I can run at the beginning of each month that will update a table and add a 4 week average for each client, for each hour of the month. I have the 3 basic parts above I believe, but for the life of me I can't figure out how to add it all together properly.
My first attempt was to create a table that simply had a row for each hour of the month, for each client that we can get calls for.
DECLARE #date DateTime SELECT DATEADD(DAY, 1, EOMONTH(getdate(), -1))
DECLARE #comp varchar SELECT DISTINCT(Campaign) FROM [Reporting].[dbo].[New_Five9_CallLog] WHERE
DATEDIFF(MM,TimeStamp,GETDATE()) <= 12
WHILE #date < EOMONTH(GETDATE())
BEGIN
WITH time_CTE ([DateTime],Comp)
AS
(
SELECT DATEADD(MONTH, DATEDIFF(MONTH, 0, #date), 0) AS [DateTime],
#comp
UNION ALL
SELECT dateadd(hour, 1, [DateTime]),
#comp
FROM time_CTE
WHERE dateadd(hour, 1, [DateTime]) < EOMONTH(#date)
)
SELECT *
FROM time_CTE
OPTION (maxrecursion 0);
SET #date = #date +1;
END;
However this did practically nothing. I understand SQL pretty well, but I have never had to do a For Loop in SQL before, and I just can't wrap my head around how to structure this to make it work.
The end table would hopefully look like this;
DateTime Campaign Avg
1/1/2021 00:00 Client 1 4
1/1/2021 00:00 Client 2 0
1/1/2021 01:00 Client 1 2
1/1/2021 01:00 Client 2 1
etc....

Answer 1

I was able to make this work with the following, which will create a row for each hour of the month, for each client that has calls.
DECLARE #CompTable TABLE (comp varchar(max))
INSERT INTO #CompTable
SELECT DISTINCT Campaign
FROM [Reporting].[dbo].[New_Five9_CallLog]
WHERE DATEDIFF(MM,TimeStamp,GETDATE()) <= 12
DECLARE #comp varchar(max)
WHILE EXISTS (SELECT 1 FROM #CompTable)
BEGIN
SELECT TOP 1 #comp = comp FROM #CompTable;
WITH Time_CTE ([DateTime])
AS (
SELECT DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()), 0) AS [DateTime]
UNION ALL
SELECT dateadd(hour, 1, [DateTime])
FROM time_CTE
WHERE dateadd(hour, 1, [DateTime]) < EOMONTH(GETDATE())
)
SELECT *,
(Select TOP 1 #comp
FROM #CompTable) AS Campaign
FROM time_CTE
OPTION (maxrecursion 0)
DELETE FROM #CompTable WHERE comp = #comp
END