Please start any new threads on our new site at We've got lots of great SQL Server experts to answer whatever question you can come up with.

Our new SQL Server Forums are live! Come on over! We've restricted the ability to create new threads on these forums.

SQL Server Forums
Profile | Active Topics | Members | Search | Forum FAQ
Save Password
Forgot your Password?

 All Forums
 SQL Server 2008 Forums
 Transact-SQL (2008)
 Simple Route Calculator in SQL
 Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic  

Starting Member

2 Posts

Posted - 01/28/2013 :  17:42:08  Show Profile  Reply with Quote
Hi All

I have a problem where I have a train network and using SQL I need to determine a route through the network, specifying a start and end station. The query that I write should be able to automatically be able to determine which stations the route needs to traverse to reach the destination.

I have produced a couple of scaled down tables to start with but I am unsure how to go about creating such a query to return the information that I require. I am familiar with the mathematical works of Dijkstra's algorithm but from what I've researched so far this can be a bit of a nightmare to implement. Is there a simpler way of devising a different solution for this, such as a series of select statements perhaps? Ideally I am looking for an output which lists the hops within the network and the cumulative distance between them to the destination. Apologies if I have lost anyone, I am happy to clarify anything above.

The tables I have are outlined below.

Place Table

PlaceID, ID : (A, 1; B, 2; C, 3; D, 4; E, 5)

Route Links Table

Start, End, Distance : (A, B, 5; A, C, 27; A, D, 20; B, C, 10; B, E, 21; C, E, 5; D, A, 5; D, E, 6)

Any help at all will be much appreciated!

Starting Member

12 Posts

Posted - 01/29/2013 :  00:58:03  Show Profile  Reply with Quote
Would you please give an example for output?

SQL Server Professional
Go to Top of Page

Starting Member

2 Posts

Posted - 01/29/2013 :  03:01:18  Show Profile  Reply with Quote
Originally posted by sqlbay

Would you please give an example for output?

The output would ideally be a table that gave me the from node, the next hop node and the cumulative distance from start to the present node.

So if i wanted to calculate a route from A to E using the values above, the output would be similar to below.


[From, To, Cumulative_Distance]
[A, B, 5]
[B, C, 15]
[C, E, 20]
Go to Top of Page
  Previous Topic Topic Next Topic  
 Reply to Topic
 Printer Friendly
Jump To:
SQL Server Forums © 2000-2009 SQLTeam Publishing, LLC Go To Top Of Page
This page was generated in 0.02 seconds. Powered By: Snitz Forums 2000