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03.09.2008 at 12:27PM PDT, ID: 23226926
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8.2

How to generate a sequence number in a query?

Asked by wsturdev in SQL Query Syntax

Tags: ,

I have the following SQL statement:
SELECT     Instance, Phase, Start_Date,
                      End_Date, Resource
FROM         vw_Info
ORDER BY Instance

It produces results as follows:
Instance      Phase      Start_Date      End_Date            Resource
1001-1      Phase 1         1/1/2008            1/31/2008      Jones, Jason
1001-2      Phase 1         1/1/2008            1/31/2008      Jones, Jason
1001-3      Phase 1         1/1/2008            1/31/2008      Garcia, Juan
1001-3      Phase 1         1/1/2008            1/31/2008      Martin, Ray
1001-4      Phase 1         1/1/2008            1/31/2008      Martin, Ray
1001-5      Phase 1         1/1/2008            1/31/2008      Garcia, Juan
1001-5      Phase 1         1/1/2008            1/31/2008      Martin, Ray
1001-5      Phase 1         1/1/2008            1/31/2008      Smith, Jane
1001-6      Phase 1         1/1/2008            1/31/2008      Martin, Ray
1001-7      Phase 1         1/1/2008            1/31/2008      Martin, Ray
1001-7      Phase 1         1/1/2008            1/31/2008      Garcia, Juan
1001-8      Phase 1         1/1/2008            1/31/2008      Garcia, Juan
1001-8      Phase 1         1/1/2008            1/31/2008      Martin, Ray

How do I modify my query so it generates a sequence number that starts over when the Instance changes, but only for those instances where there are multiple records?  It needs to produce the following:
Instance      Seq      Phase      Start_Date      End_Date            Resource
1001-1      NULL      Phase 1         1/1/2008            1/31/2008      Jones, Jason
1001-2      NULL      Phase 1         1/1/2008            1/31/2008      Jones, Jason
1001-3      1      Phase 1         1/1/2008            1/31/2008      Garcia, Juan
1001-3      2      Phase 1         1/1/2008            1/31/2008      Martin, Ray
1001-4      NULL      Phase 1         1/1/2008            1/31/2008      Martin, Ray
1001-5      1      Phase 1         1/1/2008            1/31/2008      Garcia, Juan
1001-5      2      Phase 1         1/1/2008            1/31/2008      Martin, Ray
1001-5      3      Phase 1         1/1/2008            1/31/2008      Smith, Jane
1001-6      NULL      Phase 1         1/1/2008            1/31/2008      Martin, Ray
1001-7      1      Phase 1         1/1/2008            1/31/2008      Martin, Ray
1001-7      2      Phase 1         1/1/2008            1/31/2008      Garcia, Juan
1001-8      1      Phase 1         1/1/2008            1/31/2008      Garcia, Juan
1001-8      2      Phase 1         1/1/2008            1/31/2008      Martin, Ray
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[+][-]03.09.2008 at 01:59PM PDT, ID: 21082705

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[+][-]03.09.2008 at 05:00PM PDT, ID: 21083279

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[+][-]03.09.2008 at 05:40PM PDT, ID: 21083407

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About this solution

Zone: SQL Query Syntax
Tags: SQL Server 2005, SQL Syntax
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Solution Provided By: wsturdev
Participating Experts: 1
Solution Grade: A
 
 
 
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