A visual language for querying and updating graphs

18 Nov

This chapter discusses the following topics: Object types and subtypes can be used in PL/SQL procedures and functions in most places where built-in types can appear.The parameters and variables of PL/SQL functions and procedures can be of object types.NET Change Conflict Resolution Stored Procedures Invocation The Entity Class Generator Tool Generator Tool DBML Reference Multi-tier Entities External Mapping NET Framework Function Support and Notes Debugging Support Most programs written today manipulate data in one way or another and often this data is stored in a relational database.Yet there is a huge divide between modern programming languages and databases in how they represent and manipulate information.

This will open up the Add Connection window where the default connection being displayed is MS SQL Server Compact. button which opens the Change Data Source window shown in the next figure.

The connection is set for Windows Authentication and should you test the connectivity you would get 'Success' as a reply.

However when you click on the handle for the database name to retrieve a list of databases on this server, you would get a message as shown.

Now, if I consider each edge to be directed (i.e., one way), then it's easy to work out all those nodes that I can get to directly from any node.

I'd add an index to the From Node ID column, and then run a query like this: Result: 5 But what would be the best way to structure my table/query if I want to treat each edge as unidirectional. starting from node 3, I'd like to get the results: Result: 1, 2, 5 The simplest way I can think of would be to add an additional index to the To Node ID column and then run a query like this: But this obviously involves combining result sets from two queries and doesn't seem very efficient - is there a better way to write this in a single query?