How to find date ranges in records with consecutive dates and duplicate data

Posted by alan s on Stack Overflow See other posts from Stack Overflow or by alan s
Published on 2010-05-15T07:03:56Z Indexed on 2010/05/15 7:14 UTC
Read the original article Hit count: 301

Filed under:

tsql

|

database

|

SQLServer

There's probably any easy solution for this, but I can't see it. I have a table with consecutive dates and often duplicate associated data for several of these consecutive dates:

Date       Col1  Col2
5/13/2010  1     A
5/14/2010  1     A
5/15/2010  2     B
5/16/2010  1     A
5/17/2010  1     A
5/18/2010  3     C
5/19/2010  3     C
5/20/2010  3     C

Using MS T-SQL, I wish to find the start and end dates for each run of distinct Col1 and Col2 values:

StartDate  EndDate    Col1  Col2
5/13/2010  5/14/2010  1     A
5/15/2010  5/15/2010  2     B
5/16/2010  5/17/2010  1     A
5/18/2010  5/20/2010  3     C

Assumptions: There are never any missing dates. Col1 and Col2 are not null. Any ideas - preferably that don't use cursors? Many thanks, -alan

© Stack Overflow or respective owner

Related posts about tsql

TSQL Challenge 30 - A Matrix Transposition challenge in TSQL

as seen on SQL Server Central - Search for 'SQL Server Central'
This is a matrix transposition challenge. Your job is to change the position of the numbres in a 5x5 matrix. SQL Server monitoring made easy "Keeping an eye on our many SQL Server instances is much easier with SQL Response." Mike Lile.Download a free trial of SQL Response… >>> More
Will TSQL become useless because of new ORMs? [closed]

as seen on Programmers - Search for 'Programmers'
By introducing LINQ to SQL, I found myself and my .NET developer colleagues gradually moving from TSQL to C# to create queries on the database. Entity Framework made that shift almost permanent. Now it's nearly 2 years that I use LINQ to SQL and LINQ to Entities and haven't used TSQL that much. Yesterday… >>> More
Issue Creating SQL Login for AppPoolIdentity on Windows Server 2008

as seen on Johnny Coder - Search for 'Johnny Coder'
IIS7 introduced the option to run your application pool as AppPoolIdentity. With the release of IIS7.5, AppPoolIdentity was promoted to the default option. You see this change if you’re running Windows 7 or Windows Server 2008 R2. On my Windows 7 machine, I’m able to define my Application… >>> More
The best, in the West

as seen on Simple Talk - Search for 'Simple Talk'
As many of you know, I run the SQL South West user group and we are currently in full flow preparing to stage the UK’s second SQL Saturday. The SQL Saturday spotlight is going to fall on Exeter in March 2013. We have full-day session on Friday 8th with some truly amazing speakers giving their… >>> More
Something for the weekend - Whats the most complex query?

as seen on SQL Blogcasts - Search for 'SQL Blogcasts'
Whenever I teach about SQL Server performance tuning I try can get across the message that there is no such thing as a table. Does that sound odd, well it isn't, trust me. Rather than tables you need to consider structures. You have 1. Heaps 2. Indexes (b-trees) Some people split indexes… >>> More

Related posts about database

SQL SERVER Retrieve and Explore Database Backup without Restoring Database Idera virtual database

as seen on Dot net Slackers - Search for 'Dot net Slackers'
I recently downloaded Ideras SQL virtual database, and tested it. There are a few things about this tool which caught my attention.My ScenarioIt is quite common in real life that sometimes observing or retrieving older data is necessary; however, it had changed as time passed by. The full database… >>> More
Cloning A Database On The Same Server Using Rman Duplicate From Active Database

as seen on Oracle Blogs - Search for 'Oracle Blogs'
To clone a database using Rman we used to require an existing Rman backup, on 11g we can clone databases using the "from active" database option. In this case we do not require an existing backup, the active datafiles will be used as the source for the clone. In order to clone with the source database… >>> More
cPickle ImportError: No module named multiarray

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, I'm using cPickle to save my Database into file. The code looks like that: def Save_DataBase(): import cPickle from scipy import * from numpy import * a=Results.VersionName #filename='D:/results/'+a[a.find('/')+1:-a.find('/')-2]+Results.AssType[:3]+str(random.randint(0,100))+Results.Distribution+"… >>> More
SQL SERVER – 2008 – Introduction to Snapshot Database – Restore From Snapshot

as seen on SQL Authority - Search for 'SQL Authority'
Snapshot database is one of the most interesting concepts that I have used at some places recently. Here is a quick definition of the subject from Book On Line: A Database Snapshot is a read-only, static view of a database (the source database). Multiple snapshots can exist on a source database and… >>> More
OTN ???? ?????? ???????

as seen on Oracle Blogs - Search for 'Oracle Blogs'
Database ?? Database ??????? Database ?????????? Java WebLogic Server/????????·???? SOA/BPM/????? ???????/???? ID??/?????? ?????EPM/BI EPM/BI ??????? EPM/BI ???? OS/??? ???? ????? MySQL Database ?? ???? ?? ????????? ??? ?? ORACLE MASTER… >>> More