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05.15.2008 at 04:41AM PDT, ID: 23404638
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8.5

Query to find missing sequence numbers

Asked by tomsj188 in SQL Server 2005

Hi Experts

I need some help writing a t-sql statement.
I have two tabels sentmessages and missingsentmessages,
they both contains three fields, orderid as int, seqno as int and createdate as datetime.
the seqno column is an integer ranging from 0 to 4095 starting over when it reaches 4095,
orderid is a reference to an order table and createdate is the date the row was created.

The seqno comes from cars sending in orders, and sometimes they get lost on the way, giving me holes in the sequence.
So what i want to do is create a query that get all the missing seqnos for a month and i also needs the date from the biggest lower number in that sequence.
this needs to be done given a spcific orderid.

An example
sentmessages:
orderid      seqno      createdate
1      12      2008-05-12 13:25:03.008
1      10      2008-05-12 13:25:02.194
1      9      2008-05-12 13:25:01.012
1      8      2008-05-12 13:24:55.023
1      5      2008-05-12 13:24:58.389
1      2      2008-05-12 13:23:53.117
1      1      2008-05-12 13:23:52.563
1      0      2008-05-12 13:23:49.956

missingsentmessages:
orderid      seqno      createdate
1      7      2008-05-12 13:25:03.008




Given that, the answear i want is this
orderid      seqno      createdate
1      11      2008-05-12 13:25:02.194
1      6      2008-05-12 13:24:58.389
1      4      2008-05-12 13:23:53.117
1      3      2008-05-12 13:23:53.117


This needs to be done with a very fast query, to build a iterative method for this is no good, and i can do it my self. :)

Also take in consideration that the seqno field starts over after 4095, mening that it could look lite this:
2
1
4095
4093

then the answear should be 0, and 4094


thanx
/Tomas Start Free Trial
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About this solution

Zone: SQL Server 2005
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Solution Provided By: aaronakin
Participating Experts: 2
Solution Grade: A
 
 
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