how to select specific rows..

ashish_kare · #1 (**permalink**) 12-20-05, 11:36

Hi Friends...

I have one table , suppose TableA which contains following columns..

I want to select records from this table where time difference is more than 2 min. (tec_insert_date) This means first record time and second one, then second one and third one..and so on..

How to select these records...pls give me some sql query...

thanks in advance

tec_number tec_insert_date tec_description
----------- ------------------------------------------------------ --------113909 2005-12-19 18:59:01.920 Description
113910 2005-12-19 18:59:02.043 Description
113911 2005-12-19 18:59:02.060 Description
113912 2005-12-19 18:59:02.060 Description
113913 2005-12-19 18:59:02.090 Description
113914 2005-12-19 18:59:02.090 Description
113915 2005-12-19 18:59:02.263 Description
113916 2005-12-19 18:59:02.437 Description
113917 2005-12-19 19:00:34.703 Description
113918 2005-12-19 19:00:34.720 Description
113919 2005-12-19 19:00:34.937 Description
113920 2005-12-19 19:00:35.607 Description
113921 2005-12-19 19:00:35.607 Description
113922 2005-12-19 19:00:35.840 Description
113923 2005-12-19 19:00:35.903 Description
113924 2005-12-19 19:00:36.200 Description
113925 2005-12-19 19:00:36.200 Description
113926 2005-12-19 19:00:36.217 Description
113927 2005-12-19 19:00:36.217 Description
113928 2005-12-19 19:00:36.217 Description
113929 2005-12-19 19:00:36.230 Description
113930 2005-12-19 19:00:36.230 Description
113931 2005-12-19 19:00:36.230 Description
113932 2005-12-19 19:00:36.230 Description
113933 2005-12-19 19:00:36.323 Description
113934 2005-12-19 19:00:36.450 Description
113935 2005-12-19 19:00:38.863 Description
113936 2005-12-19 19:00:38.943 Description
113937 2005-12-19 19:00:38.943 Description
113938 2005-12-19 19:00:39.100 Description
113939 2005-12-19 19:00:39.147 Description
113940 2005-12-19 19:00:39.300 Description
113941 2005-12-19 19:00:40.920 Description
113942 2005-12-19 19:01:23.363 Description
113943 2005-12-19 19:03:03.533 Description
113944 2005-12-19 19:03:08.197 Description
113945 2005-12-19 19:03:12.853 Description
113946 2005-12-19 19:03:14.087 Description
113947 2005-12-19 19:04:40.730 Description
113948 2005-12-19 19:04:44.843 Description
113949 2005-12-19 19:04:51.030 Description
113950 2005-12-19 19:04:56.313 Description
113951 2005-12-19 19:04:58.950 Description
113952 2005-12-19 19:09:19.950 Description
113953 2005-12-19 19:09:21.277 Description
113954 2005-12-19 19:09:21.340 Description
113955 2005-12-19 19:09:24.397 Description
113956 2005-12-19 19:09:35.660 Description
113957 2005-12-19 19:09:46.480 Description
113958 2005-12-19 19:09:47.790 Description
113959 2005-12-19 19:10:23.713 Description
113960 2005-12-19 19:10:23.980 Description
113961 2005-12-19 19:11:02.307 Description
113962 2005-12-19 19:11:52.040 Description
113963 2005-12-19 19:12:31.800 Description
113964 2005-12-19 19:12:31.940 Description
113965 2005-12-19 19:12:31.940 Description
113966 2005-12-19 19:13:10.500 Description
113967 2005-12-19 19:13:10.500 Description
113968 2005-12-19 19:13:50.697 Description
113969 2005-12-19 19:13:50.697 Description
113970 2005-12-19 19:13:50.743 Description
113971 2005-12-19 19:13:50.870 Description
113972 2005-12-19 19:13:50.883 Description
113973 2005-12-19 19:14:09.290 Description
113974 2005-12-19 19:14:47.680 Description
113975 2005-12-19 19:14:47.693 Description
113976 2005-12-19 19:14:48.630 Description
113977 2005-12-19 19:14:48.630 Description
113978 2005-12-19 19:14:49.127 Description
113979 2005-12-19 19:14:49.127 Description
113980 2005-12-19 19:14:49.160 Description
113981 2005-12-19 19:14:49.300 Description
113982 2005-12-19 19:14:49.313 Description
113983 2005-12-19 19:15:07.287 Description
113984 2005-12-19 19:15:07.783 Description
113985 2005-12-19 19:21:43.093 Description
113986 2005-12-19 19:22:01.920 Description
113987 2005-12-19 19:22:01.920 Description
113988 2005-12-19 19:22:20.780 Description
113989 2005-12-19 19:22:38.547 Description
113990 2005-12-19 19:22:38.547 Description
113991 2005-12-19 19:22:39.340 Description
113992 2005-12-19 19:22:39.340 Description
113993 2005-12-19 19:22:40.263 Description
113994 2005-12-19 19:22:41.010 Description
113995 2005-12-19 19:22:41.867 Description

hmscott · #2 (**permalink**) 12-20-05, 16:11

Code:

select
  a.tec_number ,
  a.tec_insert_date ,
  a.tec_description ,
  b.tec_insert_date
from
  dbo.mytable a inner join dbo.mytable b on
      a.tec_number = b.tec_number + 1  -- or -1, i'm not sure
where
  datediff(mi, a.tec_insert_date, b.tec_insert_date) > 2

Note that this depends on tec_number being sequential with no missing entries (ie, a skipped entry may lead to invalid results).

The usual caveats about my code: it's usually ugly and slow.

Your mileage may vary, blindman will be along shortly to post the correct solution!

Regards,

hmscott

blindman · #3 (**permalink**) 12-20-05, 16:44

That is what I would do, unless you have gaps in your auto-sequence. If you do, then you will need a more complex subquery to determine the prior record for each record. And the resulting SQL would be even uglier and slower.

ashish_kare · #4 (**permalink**) 12-21-05, 04:33

tec_number is in seqence always...Thanks

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