Related
I'm trying to determine the number of records with consecutive dates (previous record ends on the same date as the start date of the next record) before and after a specified date, and ignore any consecutive records as soon as there is a break in the chain.
If I have the following data:
-- declare vars
DECLARE #dateToCheck date = '2020-09-20'
DECLARE #numRecsBefore int = 0
DECLARE #numRecsAfter int = 0
DECLARE #tempID int
-- temp table
CREATE TABLE #dates
(
[idx] INT IDENTITY(1,1),
[startDate] DATETIME ,
[endDate] DATETIME,
[prevEndDate] DATETIME
)
-- insert temp table
INSERT INTO #dates
( [startDate], [endDate] )
VALUES ( '2020-09-01', '2020-09-04' ),
( '2020-09-04', '2020-09-10' ),
( '2020-09-10', '2020-09-16' ),
( '2020-09-17', '2020-09-19' ),
( '2020-09-19', '2020-09-20' ),
--
( '2020-09-20', '2020-09-23' ),
( '2020-09-25', '2020-09-26' ),
( '2020-09-27', '2020-09-28' ),
( '2020-09-28', '2020-09-30' ),
( '2020-10-01', '2020-09-05' )
-- update with previous records endDate
DECLARE #maxRows int = (SELECT MAX(idx) FROM #dates)
DECLARE #intCount int = 0
WHILE #intCount <= #maxRows
BEGIN
UPDATE #dates SET prevEndDate = (SELECT endDate FROM #dates WHERE idx = (#intCount - 1) ) WHERE idx=#intCount
SET #intCount = #intCount + 1
END
-- clear any breaks in the chain?
-- number of consecutive records before this date
SET #numRecsBefore = (SELECT COUNT(idx) FROM #dates WHERE startDate = prevEndDate AND endDate <= #dateToCheck)
-- number of consecutive records after this date
SET #numRecsAfter = (SELECT COUNT(idx) FROM #dates WHERE startDate = prevEndDate AND endDate >= #dateToCheck)
-- return & clean up
SELECT * FROM #dates
SELECT #numRecsBefore AS numBefore, #numRecsAfter AS numAfter
DROP TABLE #dates
With the specified date being '2020-09-20, I would expect #numRecsBefore = 2 and #numRecsAfter = 1. That is not what I am getting, as its counting all the consecutive records.
There has to be a better way to do this. I know the loop isn't optimal, but I couldn't get LAG() or LEAD() to work. I've spend all morning trying different methods and searching, but everything I find doesn't deal with two dates, or breaks in the chain.
This reads like a gaps-and-island problem. Islands represents rows whose date ranges are adjacent, and you want to count how many records preceed of follow a current date in the same island.
You could do:
select
max(case when #dateToCheck > startdate and #dateToCheck <= enddate then numRecsBefore end) as numRecsBefore,
max(case when #dateToCheck >= startdate and #dateToCheck < enddate then numRecsAfter end) as numRecsAfter
from (
select d.*,
count(*) over(partition by grp order by startdate) as numRecsBefore,
count(*) over(partition by grp order by startdate desc) as numRecsAfter
from (
select d.*,
sum(case when startdate = lag_enddate then 0 else 1 end) over(order by startdate) as grp
from (
select d.*,
lag(enddate) over(order by startdate) as lag_enddate
from #dates d
) d
) d
) d
This uses lag() and a cumulative sum() to define the islands. The a window count gives the number and preceding and following records on the same island. The final step is conditional aggrgation; extra care needs to be taken on the inequalities to take in account various possibilites (typically, the date you search for might not always match a range bound).
Demo on DB Fiddle
I think this is what you are after, however, this does not give the results in your query; I suspect that is because they aren't the expected results? One of the conditional aggregated may also want to be a >= or <=, but I don't know which:
WITH CTE AS(
SELECT startDate,
endDate,
CASE startDate WHEN LAG(endDate) OVER (ORDER BY startDate ASC) THEN 1 END AS IsSame
FROM #dates d)
SELECT COUNT(CASE WHEN startDate < #dateToCheck THEN IsSame END) AS numBefore,
COUNT(CASE WHEN startDate > #dateToCheck THEN IsSame END) AS numAfter
FROM CTE;
I have a table with 2628 rows in it. I want to get a count per hour. I have a completion_time column which tells the date time of per record.
I can find only one-hour count.
select count(*)
from billing b
where b.completion_time >= '2019-04-16 23:50:23'
and b.completion_time <='2019-04-17 00:50:22'
The date time is up to 9 hours. i.e. the process was started at 2016-04-16 23:50:23 and it ends on 2019-04-17 08:16:49. So I want total counts per hour.
Update 1
I want output like below
How can I achieve it? Any help would be highly appreciated.
Try this:
select datepart(hour,b.completion_time) Hour, count(*) NumberOfRecords
from billing b
group by datepart(hour,b.completion_time)
Edit:
select row_number() over (order by min(b.completion_time)) RowNumber, count(*) NumberOfRecords
from billing b
group by datepart(hour,b.completion_time)
order by min(b.completion_time)
try this.
Declare #StartTime DATETIME = '2016-04-16 23:50:23'
Declare #EndTime DateTime = '2019-04-17 08:16:49'
Declare #Tab Table(id int, Completion_Time DateTime)
Insert into #Tab
SELECT 1, '2016-04-16 23:50:23' Union All
SELECT 2,'2016-04-17 00:50:24' Union All
SELECT 3,'2016-04-17 01:50:26' Union All
SELECT 4,'2016-04-17 01:50:32' Union All
SELECT 5,'2016-04-17 01:50:55' Union All
SELECT 6,'2016-04-17 02:50:28' Union All
SELECT 7,'2016-04-17 02:50:30' Union All
SELECT 8,'2016-04-17 02:50:45' Union All
SELECT 9,'2016-04-17 04:50:32' Union All
SELECT 10,'2016-04-17 04:50:52'
--Select Id, DATEDIFF(HH,#StartTime,Completion_Time) Diff from #Tab
;with cte
As
(
SELECT CONVERT(VARCHAR(5),DATEDIFF(HH,#StartTime,Completion_Time)+1) as [Hour] , COUNT(*) As [Records]
From #Tab
Group by DATEDIFF(HH,#StartTime,Completion_Time)+1
)
Select [Hour] + CASE
WHEN [Hour] % 100 IN (11,12,13) THEN 'th'
WHEN [Hour] % 10 = 1 THEN 'st'
WHEN [Hour] % 10 = 2 THEN 'nd'
WHEN [Hour] % 10 = 3 THEN 'rd'
ELSE 'th'
END + ' hour',
Records
from cte
This will do just what you need :
SELECT HOUR(b.completion_time) hourOfDay, COUNT(*) NumberOfRecords
FROM billing b
GROUP BY hourOfDay
HOUR is a predefined function to calculate hour from a DateTime.
I have a table called test.
In test I have An ID, a value and a date.
The dates are ordered for each ID.
I want to select rows for an ID, before and after a change of value, so the following example table.
RowNum--------ID------- Value -------- Date
1------------------001 ---------1----------- 01/01/2015
2------------------001 ---------1----------- 02/01/2015
3------------------001 ---------1----------- 04/01/2015
4------------------001 ---------1----------- 05/01/2015
5------------------001 ---------1----------- 06/01/2015
6------------------001 ---------1----------- 08/01/2015
7------------------001 ---------0----------- 09/01/2015
8------------------001 ---------0----------- 10/01/2015
9------------------001 ---------0----------- 11/01/2015
10-----------------001 ---------1----------- 12/01/2015
11-----------------001 ---------1----------- 14/01/2015
12------------------002 ---------1----------- 01/01/2015
13------------------002 ---------1----------- 04/01/2015
14------------------002 ---------0----------- 05/01/2015
15------------------002 ---------0----------- 07/01/2015
The result would return rows 6, 7, 9, 10, 13, 14
You could use analytic functions LAG() and LEAD() to access value in preceding and following rows, then check that it does not match value in current row.
SELECT *
FROM (
SELECT RowNum,
ID,
Value,
Date,
LAG(VALUE, 1, VALUE) OVER(ORDER BY RowNum) PrevValue,
LEAD(VALUE, 1, VALUE) OVER(ORDER BY RowNum) NextValue
FROM test)
WHERE PrevValue <> Value
OR NextValue <> Value
Params passed to this functions are
some scalar expression (column name in this case);
offset (1 row before or after);
default value (LAG() will return NULL for first row and LEAD() will return NULL for last row, but they don't seem special in your question, so I used column value as default).
Refer the below one for without using LEAD and LAG:
DECLARE #i INT = 1,
#cnt INT,
#dstvalue INT,
#srcvalue INT
CREATE TABLE #result
(
id INT,
mydate DATE
)
CREATE TABLE #temp1
(
rn INT IDENTITY(1, 1),
id INT,
mydate DATE
)
INSERT INTO #temp1
(id,
mydate)
SELECT id,
mydate
FROM table
ORDER BY id,
mydate
SELECT #cnt = Count(*)
FROM #temp1
SELECT #srcvalue = value
FROM #temp1
WHERE rn = #i
WHILE ( #i <= #cnt )
BEGIN
SELECT #dstvalue = value
FROM #temp1
WHERE rn = #i
IF( #srcvalue = #dstvalue )
BEGIN
SET #i = #i + 1
CONTINUE;
END
ELSE
BEGIN
SET #srcvalue = #dstvalue
INSERT INTO #result
(id,
mydate)
SELECT id,
mydate
FROM #temp
WHERE rn = #i - 1
UNION ALL
SELECT id,
mydate
FROM #temp
WHERE rn = #i
END
SET #i = #i + 1
END
SELECT *
FROM #result
The answer using lag() and lead() is the right answer. If you are using a pre-SQL Server 2012 version, then you can do essentially the same thing using cross apply or a correlated subquery:
select t.*
from test t cross apply
(select top 1 tprev.*
from test tprev
where tprev.date < t.date
order by date desc
) tprev cross apply
(select top 1 tnext.*
from test tnext
where tnext.date > t.date
order by date asc
) tnext
where tprev.value <> tnext.value;
I got the following code from the following question I asked:
Passing in Week Day name to get nearest date in SQL
I need to find next 4 Weekdays based on today's date for corresponding Day-Of-Week in my table ie, if today is 2015-01-24 the result should be 1/24, 1/31, 2/7, 2/14 for Saturdays.
TABLE
SAMPLE QUERY
create table #t
(
jobId int,
personId int,
frequencyVal varchar(10)
);
insert into #t values (1,100,'Mondays'),(2,101,'Saturdays');
WITH cte(n) AS
(
SELECT 0
UNION ALL
SELECT n+1 FROM cte WHERE n < 3
)
select #t.jobId, #t.personId, #t.frequencyVal, STUFF(a.d, 1, 1, '') AS FutureDates
from #t
cross apply (SELECT CASE #t.frequencyVal
WHEN 'SUNDAYS' THEN 1
WHEN 'MONDAYS' THEN 2
WHEN 'TUESDAYS' THEN 3
WHEN 'WEDNESDAYS' THEN 4
WHEN 'THURSDAYS' THEN 5
WHEN 'FRIDAYS' THEN 6
WHEN 'SATURDAYS' THEN 7
END)tranlationWeekdays(n)
cross apply (select ',' + CONVERT(varchar(10), CONVERT(date,dateadd(WEEK, cte.n,CONVERT(DATE, DATEADD(DAY, (DATEPART(WEEKDAY, GETDATE()) + tranlationWeekdays.n) % 7, GETDATE()))))) from cte FOR XML PATH('')) a(d);
drop table #t;
EXPECTED RESULT
Gets the first day of current month.
DECLARE #FIRSTDAY DATE=DATEADD(month, DATEDIFF(month, 0, GETDATE()), 0)
Create the table and insert values
create table #t
(
jobId int,
personId int,
frequencyVal varchar(10)
);
insert into #t values (1,100,'Mondays'),(2,101,'Saturdays');
You can use either of the below queries for your situation.
QUERY 1 : Select the first 4 week of days in current month for particular week day
-- Gets the first day of current month
DECLARE #FIRSTDAY DATE=DATEADD(month, DATEDIFF(month, 0, GETDATE()), 0)
;WITH CTE as
(
-- Will find all dates in current month
SELECT #FIRSTDAY as DATES
UNION ALL
SELECT DATEADD(DAY,1,DATES)
FROM CTE
WHERE DATES < DATEADD(MONTH,1,#FIRSTDAY)
)
,CTE2 AS
(
-- Join the #t table with CTE on the datename+'s'
SELECT jobId,personId,frequencyVal, DATES,
ROW_NUMBER() OVER(PARTITION BY DATENAME(WEEKDAY,CTE.DATES) ORDER BY CTE.DATES) DATECNT
FROM CTE
JOIN #t ON DATENAME(WEEKDAY,CTE.DATES)+'s' = #t.frequencyVal
WHERE MONTH(DATES)= MONTH(GETDATE())
)
-- Converts to CSV and make sure that only 4 days are generated for month
SELECT DISTINCT C2.jobId,C2.personId,frequencyVal,
SUBSTRING(
(SELECT ', ' + CAST(DATEPART(MONTH,DATES) AS VARCHAR(2)) + '/' +
CAST(DATEPART(DAY,DATES) AS VARCHAR(2))
FROM CTE2
WHERE C2.jobId=jobId AND C2.personId=personId AND DATECNT<5
ORDER BY CTE2.DATES
FOR XML PATH('')),2,200000) futureDates
FROM CTE2 C2
SQL FIDDLE
For example, in Query1 the nearest date(here we take example as Saturday) of
2015-Jan-10 will be 01/03,01/10,01/17,01/24
2015-Jan-24 will be 01/03,01/10,01/17,01/24
QUERY 2 : Select nearest 4 week of days in current month for particular week day
-- Gets the first day in current month
DECLARE #FIRSTDAY DATE=DATEADD(month, DATEDIFF(month, 0, GETDATE()), 0)
;WITH CTE as
(
-- Will find all dates in current
SELECT CAST(#FIRSTDAY AS DATE) as DATES
UNION ALL
SELECT DATEADD(DAY,1,DATES)
FROM CTE
WHERE DATES < DATEADD(MONTH,1,#FIRSTDAY)
)
,CTE2 AS
(
-- Join the #t table with CTE on the datename+'s'
SELECT jobId,personId,frequencyVal,DATES,
-- Get week difference for each weekday
DATEDIFF(WEEK,DATES,GETDATE()) WEEKDIFF,
-- Count the number of weekdays in a month
COUNT(DATES) OVER(PARTITION BY DATENAME(WEEKDAY,CTE.DATES)) WEEKCOUNT
FROM CTE
JOIN #t ON DATENAME(WEEKDAY,CTE.DATES)+'s' = #t.frequencyVal
WHERE MONTH(DATES)= MONTH(GETDATE())
)
-- Converts to CSV and make sure that only nearest 4 week of days are generated for month
SELECT DISTINCT C2.jobId,C2.personId,frequencyVal,
SUBSTRING(
(SELECT ', ' + CAST(DATEPART(MONTH,DATES) AS VARCHAR(2)) + '/' +
CAST(DATEPART(DAY,DATES) AS VARCHAR(2))
FROM CTE2
WHERE C2.jobId=jobId AND C2.personId=personId AND C2.frequencyVal=frequencyVal AND
((WEEKDIFF<3 AND WEEKDIFF>-3 AND WEEKCOUNT = 5) OR WEEKCOUNT <= 4)
ORDER BY CTE2.DATES
FOR XML PATH('')),2,200000) futureDates
FROM CTE2 C2
SQL FIDDLE
For example, in Query2 the nearest date(here we take example as Saturday) of
2015-Jan-10 will be 01/03,01/10,01/17,01/24
2015-Jan-24 will be 01/10,01/17,01/24,01/31
QUERY 3 : Select next 4 week's dates for particular week day irrelevant of month
;WITH CTE as
(
-- Will find all dates in current month
SELECT CAST(GETDATE() AS DATE) as DATES
UNION ALL
SELECT DATEADD(DAY,1,DATES)
FROM CTE
WHERE DATES < DATEADD(DAY,28,GETDATE())
)
,CTE2 AS
(
-- Join the #t table with CTE on the datename+'s'
SELECT jobId,personId,frequencyVal, DATES,
ROW_NUMBER() OVER(PARTITION BY DATENAME(WEEKDAY,CTE.DATES) ORDER BY CTE.DATES) DATECNT
FROM CTE
JOIN #t ON DATENAME(WEEKDAY,CTE.DATES)+'s' = #t.frequencyVal
)
-- Converts to CSV and make sure that only 4 days are generated for month
SELECT DISTINCT C2.jobId,C2.personId,frequencyVal,
SUBSTRING(
(SELECT ', ' + CAST(DATEPART(MONTH,DATES) AS VARCHAR(2)) + '/' +
CAST(DATEPART(DAY,DATES) AS VARCHAR(2))
FROM CTE2
WHERE C2.jobId=jobId AND C2.personId=personId AND C2.frequencyVal=frequencyVal
AND DATECNT < 5
ORDER BY CTE2.DATES
FOR XML PATH('')),2,200000) futureDates
FROM CTE2 C2
SQL FIDDLE
The following would be the output if the GETDATE() (if its Saturday) is
2015-01-05 - 1/10, 1/17, 1/24, 1/31
2015-01-24 - 1/24, 1/31, 2/7, 2/14
This is a simpler way I think, and I think it fits your requirements
Note that I have changed your frequency_val column to an integer that represents the day of the week from SQL servers perspective and added a calculated column to illustrate how you can easily derive the day name from that.
/*************************************************/
--Set up our sample table
/*************************************************/
declare #t table
(
jobId int,
personId int,
--frequencyVal varchar(10) -- why store a string when a tiny int will do.
frequency_val tinyint,
frequency_day as datename(weekday,frequency_val -1) + 's'
)
insert into #t
values
(1,100,1),--'Mondays'),
(2,101,6),--'Saturdays');
(3,101,7),--'Sundays');
(4,100,2)--'Tuesdays'),
--select * from #t
/*************************************************/
--Declare & initialise variables
/*************************************************/
declare #num_occurances int = 4
declare #from_date date = dateadd(dd,3,getdate()) -- this will allow you to play with the date simply by changing the increment value
/*************************************************/
-- To get a row for each occurance
/*************************************************/
;with r_cte (days_ahead, occurance_date)
as (select 0, convert(date,#from_date,121)
union all
select r_cte.days_ahead +1, convert(date,dateadd(DD, r_cte.days_ahead+1, #from_date),121)
from r_cte
where r_cte.days_ahead < (7 * #num_occurances) -1
)
select t.*, r_cte.occurance_date
from
#t t
inner join r_cte
on DATEPART(WEEKDAY, dateadd(dd,##DATEFIRST - 1 ,r_cte.occurance_date)) = t.frequency_val
/*************************************************/
--To get a single row with a CSV of every occurance
/*************************************************/
;with r_cte (days_ahead, occurance_date)
as (select 0, convert(date,#from_date,121)
union all
select r_cte.days_ahead +1, convert(date,dateadd(DD, r_cte.days_ahead+1, #from_date),121)
from r_cte
where r_cte.days_ahead < (7 * #num_occurances) -1
)
select
t.*,
STUFF( (select ', '
+ convert(varchar(2),datepart(month,occurance_date),0) + '/'
+ convert(varchar(2),datepart(day,occurance_date),0) as occurance
from r_cte
where DATEPART(WEEKDAY, dateadd(dd,##DATEFIRST - 1 ,r_cte.occurance_date)) = t.frequency_val
FOR XML PATH (''),TYPE).value('.','varchar(30)')
,1,2,'') occurance_date -- rest of STUFF() function
from
#t t
Not sure how to even phrase the title on this one!
I have the following data:
IF OBJECT_ID ('tempdb..#data') IS NOT NULL DROP TABLE #data
CREATE TABLE #data
(
id UNIQUEIDENTIFIER
,reference NVARCHAR(30)
,start_date DATETIME
,end_date DATETIME
,lapse_date DATETIME
,value_received DECIMAL(18,3)
)
INSERT INTO #data VALUES ('BE91B9C1-C02F-46F7-9B63-4D0B25D9BA2F','168780','2006-05-01 00:00:00.000',NULL,'2011-09-27 00:00:00.000',537.42)
INSERT INTO #data VALUES ('B538F123-C839-447A-B300-5D16EACF4560','320858','2011-08-08 00:00:00.000',NULL,NULL,0)
INSERT INTO #data VALUES ('1922465D-2A55-434D-BAAA-8E15D681CF12','306597','2011-04-08 00:00:00.000','2011-06-22 13:14:40.083','2011-08-07 00:00:00.000',12)
INSERT INTO #data VALUES ('7DF8FBCC-B490-4892-BDC5-8FD2D73B0323','321461','2011-07-01 00:00:00.000',NULL,'2011-09-25 00:00:00.000',8.44)
INSERT INTO #data VALUES ('1EC2E754-F325-4313-BDFC-9010E255F6FE','74215','2000-10-31 00:00:00.000',NULL,'2011-08-30 00:00:00.000',258)
INSERT INTO #data VALUES ('9E59B09C-0198-48AC-8EEC-A0D76CEA9385','169194','2008-06-25 00:00:00.000',NULL,'2011-09-25 00:00:00.000',1766.4)
INSERT INTO #data VALUES ('97CF6C0F-324A-49A6-B9D8-AC848A1F821A','288039','2010-09-01 00:00:00.000','2011-07-29 00:00:00.000','2011-08-21 00:00:00.000',55)
INSERT INTO #data VALUES ('97CF6C0F-324A-49A6-B9D8-AC848A1F821A','324423','2011-08-01 00:00:00.000',NULL,'2011-09-25 00:00:00.000',5)
INSERT INTO #data VALUES ('D5E5197A-E8E1-468C-9991-C8712224C2BF','323395','2011-08-25 00:00:00.000',NULL,NULL,0)
INSERT INTO #data VALUES ('0EC4976C-16B9-4C99-BD07-D0CBDF014D32','323741','2011-08-25 00:00:00.000',NULL,NULL,0)
And I want to be able to group all references into a category of 'active', 'lapsed' or 'new' based upon the following criteria:
Active has a start date that is less than the last date of the reference month, a lapse date after the last day of the prior month and a value_received > 0;
New has a start date which falls within the reference month;
Lapsed has a lapse date which falls within the reference month.
And to then apply these definitions for each reference for a rolling 13 months (so from Now going back as far as July 2010) so that for each month I can see how many references fall into each group.
I am able to use the following to define this for the current month:
select
id
,reference
,start_date
,end_date
,lapse_date
,value_received
,CASE WHEN start_date < DATEADD(month,DATEPART(Month,GETDATE()) + 1,DATEADD(year,DATEPART(year,GETDATE())-1900,0)) --next month start date
AND lapse_date > DATEADD(ms,-3,DATEADD(mm,DATEDIFF(mm,0,GETDATE())+1,0)) --last day of current month
AND value_received > 0
THEN 'Active'
WHEN lapse_date < DATEADD(month,DATEPART(Month,GETDATE()) + 1,DATEADD(year,DATEPART(year,GETDATE())-1900,0)) --next month start
AND lapse_date > DATEADD(ms,-3,DATEADD(mm,DATEDIFF(mm,0,GETDATE()),0)) --last day of prior month
THEN 'lapse'
WHEN start_date < DATEADD(month,DATEPART(Month,GETDATE()) + 1,DATEADD(year,DATEPART(year,GETDATE())-1900,0)) --next month start date
AND start_date > DATEADD(ms,-3,DATEADD(mm,DATEDIFF(mm,0,GETDATE()),0)) --last day of prior month
THEN 'New'
ELSE 'Not applicable'
END AS [type]
from #data
But I can't see a nice / efficient way of doing this (other than to repeat this query 13 times and union the results, which I know is just awful)
Would this be a case for using the current month as an anchor and using recursion (if so, some pointers would be most appreciated)?
Any help most appreciated as always :)
* Edited to include actual solution *
In case it's of interest to anyone, this is the final query I used:
;WITH Months as
(
SELECT DATEADD(ms,-3,DATEADD(mm,DATEDIFF(mm,0,GETDATE())+1,0)) as month_end
,0 AS level
UNION ALL
SELECT DATEADD(month, -1, month_end)as month_end
,level + 1 FROM Months
WHERE level < 13
)
SELECT
DATENAME(Month,month_end) + ' ' + DATENAME(YEAR,month_end) as date
,SUM(CASE WHEN start_date <= month_end
AND Month(start_date) <> MONTH(Month_end)
AND lapse_date > Month_end
THEN 1 ELSE 0 END) AS Active
,SUM(CASE WHEN start_date <= Month_end
AND DATENAME(MONTH,start_date) + ' ' + DATENAME(YEAR,start_date) =
DATENAME(MONTH,month_end) + ' ' + DATENAME(YEAR,month_end)
THEN 1 ELSE 0 END) AS New
,SUM(CASE WHEN lapse_date <= Month_end
AND Month(lapse_date) = MONTH(Month_end)
THEN 1 ELSE 0 END) AS lapse
FROM #data
CROSS JOIN Months
WHERE id IS NOT NULL
AND start_date IS NOT NULL
GROUP BY DATENAME(Month,month_end) + ' ' + DATENAME(YEAR,month_end)
ORDER by MAX(level) ASC
You don't need a "real" recursive CTE here. You can use one for the month references though:
;WITH Months
as
(
SELECT DATEADD(day, -DATEPART(day, GETDATE())+1, GETDATE()) as 'MonthStart'
UNION ALL
SELECT DATEADD(month, -1, MonthStart) as 'MonthStart'
FROM Months
)
Then you can JOIN to SELECT TOP 13 * FROM Months in your above query.
I'm not going to try to parse all your CASE statements, but essentially you can use a GROUP BY on the date and the MonthStart fields, like:
GROUP BY Datepart(year, monthstart), Datepart(month, monthstart)
and aggregate by month. It will probably be easiest to have all your options (active, lapsed, etc) as columns and calculate each with a SUM(CASE WHEN ... THEN 1 ELSE 0 END) as it will be easier with a GROUP BY.
You can cross join your request with a recursive CTE, this is a good idea.
WITH thirteenMonthBack(myDate, level) as
(
SELECT GETDATE() as myDate, 0 as level
UNION ALL
SELECT DATEADD(month, -1, myDate), level + 1
FROM thirteenMonthBack
WHERE level < 13
)
SELECT xxx
FROM youQuery
CROSS JOIN thirteenMonthBack
DECLARE #date DATE = GETDATE()
;WITH MonthsCTE AS (
SELECT 1 [Month], DATEADD(DAY, -DATEPART(DAY, #date)+1, #date) as 'MonthStart'
UNION ALL
SELECT [Month] + 1, DATEADD(MONTH, 1, MonthStart)
FROM MonthsCTE
WHERE [Month] < 12 )
SELECT * FROM MonthsCTE
/*
| The below SELECT statements show TWO examples of how this can be useful.
| Example 1 SELECT: Simple example of showing how to generate 12 days ahead based on date entered
| Example 2 SELECT: This example shows how to generate 12 months ahead based on date entered
| This example tries to mimic as best it can Oracles use of LEVEL and CONNECT BY LEVEL
*/
WITH dynamicRecords(myDate, level) AS
(
SELECT GETDATE() AS myDate, 1 AS level
UNION ALL
SELECT myDate + 1, level + 1 /* 12 Days - WHERE level < 12 */
--SELECT DATEADD(month, 1, myDate), level + 1 /* 12 Months - WHERE level < 12 */
FROM dynamicRecords
WHERE level < 12
)
SELECT *
FROM dynamicRecords
Option (MaxRecursion 0) /* The default MaxRecursion setting is 100. Generating more than 100 dates using this method will require the Option (MaxRecursion N) segment of the query, where N is the desired MaxRecursion setting. Setting this to 0 will remove the MaxRecursion limitation altogether */
Screenshots:
/* Original T-SQL Solution I found here: https://riptutorial.com/sql-server/example/11098/generating-date-range-with-recursive-cte
| The below provides an example of how to generate the days within a date range of the dates entered.
| The below SELECT statements show TWO examples of how this can be useful.
| Example 1 SELECT: Uses static dates to display ALL of the dates within the range for the dates entered
| Example 2 SELECT: This example uses GETDATE() and then obtains the FOM day and the EOM day of the dates
| beging entered to then show all days in the month of the dates entered.
*/
With DateCte AS
(
SELECT CAST('2021-04-21' AS DATE) AS BeginDate, CAST('2022-05-02' AS DATE) AS EndDate
--SELECT CAST( GETDATE() - Day(GETDATE()) + 1 AS DATE ) AS BeginDate, CAST(EOMONTH(GETDATE()) AS DATE) AS EndDate
UNION ALL
SELECT DateAdd(Day, 1, BeginDate), EndDate
FROM DateCte
WHERE BeginDate < EndDate
)
Select BeginDate AS Dates
From DateCte
Option (MaxRecursion 0) /* The default MaxRecursion setting is 100. Generating more than 100 dates using this method will require the Option (MaxRecursion N) segment of the query, where N is the desired MaxRecursion setting. Setting this to 0 will remove the MaxRecursion limitation altogether */
;
Screenshot: