SQL Self Join Query Help

Posted by hdoe123 on Stack Overflow See other posts from Stack Overflow or by hdoe123
Published on 2010-04-17T10:12:27Z Indexed on 2010/04/17 10:23 UTC
Read the original article Hit count: 392

Filed under:

sql

|

tsql

|

mysql

|

sql-server-2005

|

sqlserver2005

Hi All,

I'm trying to work out a query that self join itself on a table using the eventnumber. I've never done a self join before.

What i'm trying to query is when a client has started off in a city which is chester to see what city they moved to. But I dont want to be able to see if they started off in another city. I would also like be only see the move once (So i'd only like to see if they went from chester to london rather then chester to london to wales)

The StartTimeDate is the same EndDateTime if they moved to another city.

Data example as follows if they started off in the city chester :-

 
clientid      EventNumber       City             StartDateTime                  EndDateTime
1                  1            Chester          10/03/2009               11/04/2010 13:00
1                  1            Liverpool        11/04/2010 13:00         30/06/2010 16:00 
1                  1            Wales            30/07/2010 16:00

the result I would like to see is on the 2nd row - so it only shows me liverpool.

Could anyone point in the right direcetion please?

© Stack Overflow or respective owner

Related posts about sql

SQL SERVER – Concat Strings in SQL Server using T-SQL – SQL in Sixty Seconds #035 – Video

as seen on SQL Authority - Search for 'SQL Authority'
Concatenating string is one of the most common tasks in SQL Server and every developer has to come across it. We have to concat the string when we have to see the display full name of the person by first name and last name. In this video we will see various methods to concatenate the strings. SQL… >>> More
SQL SERVER – Concat Function in SQL Server – SQL Concatenation

as seen on SQL Authority - Search for 'SQL Authority'
Earlier this week, I was delivering Advanced BI training on the subject of “SQL Server 2008 R2″. I had great time delivering the session. During the session, we talked about SQL Server 2010 Denali. Suddenly one of the attendees suggested his displeasure for the product. He said, even though… >>> More
Error with SQL Server Setup 2012 on Windows 2012

as seen on Server Fault - Search for 'Server Fault'
I am trying to install SQL Server on Windows 2012. I was able to finally get the wizard up and running after making some changes on the server, but now it fails no matter what I do with the following error: TITLE: SQL Server Setup failure. SQL Server Setup has encountered the following error: … >>> More
How can I detect which version of SQL (eg SQL 2008 or SQL Azure)

as seen on Stack Overflow - Search for 'Stack Overflow'
I need to detect which version of SQL I am dealing with to perorm various tasks, I need specifically detect if I am on SQL 2008 or SQL Azure. How can I do this with detection code written in SQL? >>> More
Nested SQL Select statement fails on SQL Server 2000, ok on SQL Server 2005

as seen on Stack Overflow - Search for 'Stack Overflow'
Here is the query: INSERT INTO @TempTable SELECT UserID, Name, Address1 = (SELECT TOP 1 [Address] FROM (SELECT TOP 1 [Address] FROM [UserAddress] ua INNER JOIN UserAddressOrder uo ON ua.UserID = uo.UserID WHERE ua.UserID = u.UserID ORDER BY uo.AddressOrder ASC) q ORDER BY AddressOrder… >>> More

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