Is it possible in MySQL to easily to get the number of days between two dates, group by months and then disperse those days between the months, so that when I group by month, I get to see how many days inbetween two those two dates fall into each month.
Example: creation 05.05.2014 to expiration 06.06.2014 returns 32 days. I want to display this as:
May: 26 days June: 5 days
So far I've got:
SELECT MONTHNAME(date) as month_name,
SUM(DATEDIFF(expiration, date)) AS num_days
FROM reservations
GROUP BY month_name
But it doesn't disperse the days corretly by month, just drop them all into the group-by -start-date-month, obviously. Any ideas would be highly appriciated.
I would build a comprehensive date temp table (or CTE) first.
From there you can select what you'd like, and group it however suits your needs.
IF OBJECT_ID('TEMPDB..#Dates') IS NOT NULL DROP TABLE #Dates
DECLARE @StartDate DATETIME, @EndDate DATETIME
SET @StartDate = '05/05/2014'
SET @EndDate = '06/06/2014'
;WITH Dates AS
(
SELECT CAST(CONVERT(VARCHAR(8), @StartDate,112) AS INT) AS DateId
, CAST(@StartDate AS DATE) AS Date
, CAST(@StartDate AS DATETIME) AS DateTime
, DATEPART(QUARTER, @StartDate) AS QuarterId
, 'Q' + CAST(DATEPART(QUARTER,@StartDate) AS CHAR(1)) AS Quarter
, DATEPART(MONTH, @StartDate) AS MonthId
, DATENAME(MONTH, @StartDate) AS Month
, DATEPART(DAY, @StartDate) AS Day
, DATEPART(YEAR, @StartDate) AS Year
, DATENAME(DW,@StartDate) AS DayOfWeek
, DATEPART(DAYOFYEAR, @StartDate) AS DayOfYear
UNION ALL
SELECT CAST(CONVERT(VARCHAR(8),DATEADD(DAY, 1, D.DateTime), 112) AS INT) ASDateId
, CAST(DATEADD(DAY, 1, D.DateTime) AS DATE) AS Date
, CAST(DATEADD(DAY, 1, D.DateTime) AS DATETIME) AS DateTime
, DATEPART(QUARTER,DATEADD(DAY,1,D.DateTime)) AS QuarterId
,'Q'+CAST(DATEPART(QUARTER,DATEADD(DAY, 1, D.DateTime)) AS CHAR(1)) AS Quarter
, DATEPART(MONTH,DATEADD(DAY, 1, D.DateTime)) AS MonthId
, DATENAME(MONTH,DATEADD(DAY, 1,D.DateTime)) AS Month
, DATEPART(DAY,DATEADD(DAY, 1, D.DateTime)) AS Day
, DATEPART(YEAR,DATEADD(DAY, 1, D.DateTime)) AS Year
, DATENAME(DW,DATEADD(DAY,1, D.DateTime)) AS DayOfWeek
, DATEPART(DAYOFYEAR,DATEADD(DAY,1, D.DateTime)) AS DayOfYear
FROM Dates AS D
WHERE D.DateTime < @EndDate
)
SELECT DateId AS DateId
, Date AS Date
, DateTime AS DateTime
, QuarterId AS QuarterId
, Quarter AS Quarter
, MonthId AS MonthId
, Month AS Month
, Day AS Day
, Year AS Year
, DayOfWeek AS DayOfWeek
, DayOfYear AS DayOfYear
, ROW_NUMBER() OVER(ORDER BY DateId)-1 AS DayCount
INTO #Dates
FROM Dates AS D
ORDER BY D.DateId
OPTION (MAXRECURSION 32767)
-- SELECT * FROM #Dates
SELECT COUNT(Day) AS CountOfDays, Month
FROM #Dates
GROUP BY Month
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