How can I get the count of inserts per minute in SQL - sql

Question

I have a table that looks like this
id
name
CreatedDate
1
test1
2014-06-30 09:00:00
1
test2
2014-06-30 09:01:10
1
test3
2014-06-30 09:01:23
1
test4
2014-06-30 09:01:43
1
test5
2014-06-30 09:02:02
1
test6
2014-06-30 09:02:34
1
test7
2014-06-30 09:03:22
1
test8
2014-06-30 09:03:28
1
test9
2014-06-30 09:04:14
1
test10
2014-06-30 09:04:22
1
test11
2014-06-30 09:04:28
I want to get the number of inserts that have happened per minute so the output looks like this
Inserts Per Min
Start Time
End Time
1
09:00:00
09:00:00
3
09:01:10
09:01:43
2
09:02:02
09:00:34
2
09:03:22
09:03:28
3
09:04:14
09:04:28
How can I do that?
This is the code that I have that gives me the Inserts per day but I can't get this to work per minute
Select Count(CreatedDate) as InsertsPerDay, Convert(varchar, CreatedDate, 101) as CreatedDate
From MyTable
Where DATEDIFF(day, CreatedDate, GETDATE())) < 30
Group By Convert(varchar, CreatedDate, 101)
Order By InsertsPerDay DESC

Answer 1

use subqueries and lag
declare #tmp as table(id int, name varchar(20), CreatedDate datetime)
insert into #tmp values(
1,'test1','2014-06-30 09:00:00')
,(1,'test2','2014-06-30 09:01:10')
,(1,'test3','2014-06-30 09:01:23')
,(1,'test4','2014-06-30 09:01:43')
,(1,'test5','2014-06-30 09:02:02')
,(1,'test6','2014-06-30 09:02:34')
,(1,'test7','2014-06-30 09:03:22')
,(1,'test8','2014-06-30 09:03:28')
,(1,'test9','2014-06-30 09:04:14')
,(1,'test1','2014-06-30 09:04:22')
,(1,'test11','2014-06-30 09:04:28')
select
IsNull(sum(case when Seconds between 0 and 60 then 1 end),0) Minute_One,
IsNull(sum(case when Seconds between 61 and 60*2 then 1 end),0) Minute_Two,
IsNull(sum(case when Seconds > 60*2 then 1 end),0) Minute_Others
from
(
select
(DATEPART(HOUR, DiffCreatedDate) * 3600) +
(DATEPART(MINUTE, DiffCreatedDate) * 60) +
(DATEPART(SECOND, DiffCreatedDate)) Seconds
from
(
select
CreatedDate-PriorCreatedDate DiffCreatedDate
from
(
select
CreatedDate,
lag(CreatedDate,1) over(order by CreatedDate) PriorCreatedDate
from #tmp
)x
)y
)z
--order by Seconds

Answer 2

DECLARE #Mytimes TABLE
(
id INT IDENTITY NOT NULL PRIMARY KEY,
name VARCHAR(10),
CreatedDate DATETIME
);
INSERT INTO #Mytimes
(
[name],
CreatedDate
)
VALUES
('test1', '2014-06-30 09:00:00'),
('test2', '2014-06-30 09:01:10'),
('test3', '2014-06-30 09:01:23'),
('test4', '2014-06-30 09:01:43'),
('test5', '2014-06-30 09:02:02'),
('test6', '2014-06-30 09:02:34'),
('test7', '2014-06-30 09:03:22'),
('test8', '2014-06-30 09:03:28'),
('test9', '2014-06-30 09:04:14'),
('test10', '2014-06-30 09:04:22'),
('test11', '2014-06-30 09:04:28');
WITH TALLY
AS (SELECT TOP (1440)
ROW_NUMBER() OVER (ORDER BY t1.object_id) AS N
FROM sys.all_columns t1
CROSS JOIN sys.all_columns t2),
ranges
AS (SELECT CAST(DATEADD(MINUTE, N - 1, '00:00') AS TIME(0)) AS [from],
CAST(DATEADD(MINUTE, N, '00:00') AS TIME(0)) AS [to]
FROM TALLY),
myTimes
AS (SELECT CAST(CreatedDate AS TIME(0)) ct
FROM #Mytimes)
--SELECT r.[from],
-- r.[to],
SELECT MIN(t.ct) [from],
MAX(t.ct) [to],
COUNT(t.ct)
FROM ranges r
-- If you want all minutes regardless there is inserts
--LEFT JOIN myTimes t
INNER JOIN myTimes t
ON t.ct >= r.[from]
AND t.ct < r.[to]
GROUP BY r.[from],
r.[to]
ORDER BY r.[from];
Note: In case of left join, you would need to edit the select to use coalesce for min(),max() times. ie:
...
SELECT MIN(COALESCE(t.ct, r.[from])) [from],
MAX(COALESCE(t.ct, r.[to])) [to],
COUNT(t.ct)
FROM ranges r
LEFT JOIN myTimes t
ON t.ct >= r.[from]
AND t.ct < r.[to]
GROUP BY r.[from],
r.[to]
ORDER BY r.[from];

Answer 3

This might work on 2008. (but can't verify)
Select
Count(CreatedDate) As [Inserts Per Min]
, Min(Cast(CreatedDate As Time(0))) As [Start Time]
, Max(Cast(CreatedDate As Time(0))) As [End Time]
From MyTable
--Where CreatedDate > DateAdd(month, -1, GetDate())
Group By Convert(SmallDateTime, Convert(Char(16), CreatedDate, 120))
Order By [Inserts Per Min] Desc;
Inserts Per Min
Start Time
End Time
3
09:01:10
09:01:43
3
09:04:14
09:04:28
2
09:02:02
09:02:34
2
09:03:22
09:03:28
1
09:00:00
09:00:00
Demo on db<>fiddle here