How can I Filter all records where same id's Time differ a few seconds sql server -

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this select statement data between dates:

select distinct events.clock,events.tagid        events (datediff(second, events.clock, '2013/04/20') <= 30) , (datediff(second,                     events.clock, '2013/04/21') >= 30) order events.tagid desc

this results statement.

     | clock               |  tagid        |  --------------------------------------------- 1    | 2013-04-20 12:39:18 | 4cb0000060032 |  2    | 2013-04-20 12:39:16 | 4cb0000060032 |  3    | 2013-04-20 16:53:09 | 4cb0000060032 |  4    | 2013-04-20 13:22:38 | 4cb00000600ef |  5    | 2013-04-20 13:22:40 | 4cb00000600ef |  6    | 2013-04-20 15:20:56 | 4cb00000600d2 |  7    | 2013-04-20 15:17:31 | 4cb00000600d2 |  8    | 2013-04-20 15:20:58 | 4cb00000600d2 |  9    | 2013-04-20 19:33:09 | 4cb00000600d1 |  10   | 2013-04-20 20:39:16 | 4cb00000600d1 |  11   | 2013-04-20 11:10:38 | 4cb00000600d1 |

now filter results more because can see there records time differ in milliseconds , others in seconds, rid of records same tagid , time follows few seconds/milliseconds. duplicates of tagid fine not times few seconds/milliseconds apart another.

thus record 2, 4, 6, 7 not there.

then results following:

    | clock               |  tagid        |  ------------------------------------------- 1   | 2013-04-20 12:39:18 | 4cb0000060032 |  2   | 2013-04-20 16:53:09 | 4cb0000060032 |  3   | 2013-04-20 13:22:40 | 4cb00000600ef | 4   | 2013-04-20 15:20:58 | 4cb00000600d2 |  5   | 2013-04-20 19:33:09 | 4cb00000600d1 |  6   | 2013-04-20 20:39:16 | 4cb00000600d1 | 7   | 2013-04-20 11:10:38 | 4cb00000600d1 |

create temp table hold resuls current query:

create table #events ( clock datetime, tagid varchar(20) )

your current query:

insert #events select distinct events.clock,events.tagid        events (datediff(second, events.clock, '2013/04/20') <= 30)  , (datediff(second, events.clock, '2013/04/21') >= 30) order events.tagid desc

then select rows there no earlier dated row (for same tagid) within timeframe. i've used 3000 milliseconds here example.

select * #events e1 not exists (select 1 #events e2  e2.tagid = e1.tagid    , e2.clock < e1.clock    , datediff(millisecond, e2.clock, e1.clock) < 3000)

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