Complex SQL QUERY with DateDIFF

Please start any new threads on our new site at https://forums.sqlteam.com. We've got lots of great SQL Server experts to answer whatever question you can come up with.

All Forums

SQL Server 2012 Forums

Transact-SQL (2012)

Complex SQL QUERY with DateDIFF

Author

Topic

CostaSBD
Starting Member

5 Posts

Posted - 2013-02-25 : 10:09:44

Hi all,

I need to script a query to discard access logs that not exceeding a predetermined margin (eg. 2 seconds). That is, if each record was made by a user on a especific date / time, I don't want to get those who its date / time does not exceed the range compared with the date / time of the previous record. I think an example is clearer.

Example:

LogIndex, UserID, Date / Time

1. 01551, 20.02.2013 17:41:45.000
2. 01551, 20.02.2013 17:41:45.900 *
3. 01551, 20.02.2013 17:41:46.150 *
4. 01551, 20.02.2013 20:41:47.000

5. 01552, 02/20/2013 17:42:45.000
6. 01552, 20.02.2013 17:42:46.000 *
7. 01552, 02/20/2013 19:45:45.000

*: Records to discard because its date / time does not exceed the margin of 2 seconds over the previous record. In the first case two records should be discarted because both not exceed this margin.

Here's the code that creates the temporary table and adds the previous records to test:

CREATE TABLE # TEMP (LogIndex int, UserID nvarchar (10), LogTime datetime)

insert into # temp select 1, '01551 ', '20 / 02/2013 17:41:45.000'
insert into # temp select 2, '01551 ', '20 / 02/2013 17:41:45.900'
insert into # temp select 3, '01551 ', '20 / 02/2013 17:41:46.150'
insert into # temp select 4, '01551 ', '20 / 02/2013 20:41:47.000'
insert into # temp select 5, '01552 ', '20 / 02/2013 17:42:45.000'
insert into # temp select 6, '01552 ', '20 / 02/2013 17:42:46.000'
insert into # temp select 7, '01552 ', '20 / 02/2013 19:45:45.000'

select * from # temp

DROP TABLE # temp

Thanks in advance!

James K
Master Smack Fu Yak Hacker

3873 Posts

Posted - 2013-02-25 : 10:24:18

[code]SELECT a.*
FROM #temp a
WHERE NOT EXISTS
(
SELECT * FROM #temp b
WHERE b.LogIndex = a.LogIndex-1 AND
DATEDIFF(ss,b.Logtime,a.Logtime) < 2
)[/code]

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2013-02-26 : 03:15:22

[code]
select LogIndex,UserID,LogTime
FROM
(
select *,Row_Number() over (partition by UserID,((DATEDIFF(ss,'20000101',logtime)-1)/2*2) +1 ORDER BY LogTime) AS Rn from #temp
)t
WHERE Rn=1

output
-------------------------
LogIndex UserID LogTime
-----------------------------------------
1 01551 2013-02-20 17:41:45.000
4 01551 2013-02-20 20:41:47.000
5 01552 2013-02-20 17:42:45.000
7 01552 2013-02-20 19:45:45.000

[/code]

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

CostaSBD
Starting Member

5 Posts

Posted - 2013-03-12 : 08:45:51

hi all,

Thanks a lot for the answers but if i put more records for the same userId doesn't works fine:

insert into TEMP select 1, '01551', '20/02/2013 17:41:45.000' --ok
insert into TEMP select 19, '01551', '20/02/2013 17:41:45.400'
insert into TEMP select 20, '01551', '20/02/2013 17:41:45.700'
insert into TEMP select 8, '01551', '20/02/2013 17:41:45.800'
insert into TEMP select 2, '01551', '20/02/2013 17:41:45.900'
insert into TEMP select 9, '01551', '20/02/2013 17:41:45.950'
insert into TEMP select 21, '01551', '20/02/2013 17:41:46.100'
insert into TEMP select 3, '01551', '20/02/2013 17:41:46.150'
insert into TEMP select 22, '01551', '20/02/2013 17:41:46.990'
insert into TEMP select 31, '01551', '20/02/2013 17:41:47.140'--ok
insert into TEMP select 32, '01551', '20/02/2013 17:41:47.940'
insert into TEMP select 33, '01551', '20/02/2013 17:41:48.120'
insert into TEMP select 34, '01551', '20/02/2013 17:41:48.720'
insert into TEMP select 10, '01551', '20/02/2013 20:41:45.600'--ok
insert into TEMP select 11, '01551', '20/02/2013 20:41:45.900'
insert into TEMP select 4, '01551', '20/02/2013 20:41:47.000'
insert into TEMP select 35, '01551', '20/02/2013 20:41:47.100'
insert into TEMP select 36, '01551', '20/02/2013 20:41:47.600'--ok
insert into TEMP select 37, '01551', '20/02/2013 20:41:47.900'
insert into TEMP select 24, '01551', '20/02/2013 20:41:47.700'
insert into TEMP select 25, '01551', '20/02/2013 20:41:48.990'
insert into TEMP select 26, '01551', '20/02/2013 20:41:49.100'

insert into TEMP select 5, '01552', '20/02/2013 17:42:45.000'--ok
insert into TEMP select 12, '01552', '20/02/2013 17:42:45.500'
insert into TEMP select 6, '01552', '20/02/2013 17:42:46.000'
insert into TEMP select 13, '01552', '20/02/2013 17:42:46.800'
insert into TEMP select 12, '01552', '20/02/2013 17:42:45.500'
insert into TEMP select 27, '01552', '20/02/2013 17:42:46.100'
insert into TEMP select 28, '01552', '20/02/2013 17:42:46.600'
insert into TEMP select 29, '01552', '20/02/2013 19:45:45.400'--ok
insert into TEMP select 30, '01552', '20/02/2013 19:45:45.900'
insert into TEMP select 15, '01552', '20/02/2013 19:45:46.200'

insert into TEMP select 16, '01553', '20/02/2013 19:45:45.100'--ok
insert into TEMP select 17, '01553', '20/02/2013 19:45:45.600'
insert into TEMP select 18, '01553', '20/02/2013 23:45:45.000'--ok
insert into TEMP select 19, '01553', '20/02/2013 23:45:45.200'

with this records i have 8 rows to show

How can i do it?

thanks for advance

Subscribe to SQLTeam.com

SQLTeam.com Articles via RSS

SQLTeam.com Weblog via RSS

- Advertisement -

Resources