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    <p>Warning! using DefiningQuerys can be VERY SLOW!</p> <p>Here's an example:</p> <p>If this is the defining query that you create an Entity against:</p> <pre><code>Select C.CustomerID, C.FirstName, C.LastName, G.SalesCatetory From CustomerDatabase.dbo.Customers C Inner Join MarketingDatabase.dbo.CustomerCategories G on G.CustomerID = C.CustomerID </code></pre> <p>Then when you do a select against the Entity by CustomerID, the SQL trace looks something like this:</p> <pre><code>Select [Extent1].[CustomerID] as [CustomerID], [Extent1].[FirstName] as [FirstName], [Extent1].[LastName] as [LastName], [Extent1].[SalesCatetory] as [SalesCatetory] From ( Select C.CustomerID, C.FirstName, C.LastName, G.SalesCatetory From CustomerDatabase.dbo.Customers C Inner Join MarketingDatabase.dbo.CustomerCategories G on G.CustomerID = C.CustomerID ) as [Extent1] Where '123456' = [Extent1].[CustomerID] </code></pre> <p>SQL Server may run this query very slowly. I had one case, a little more complicated than the above example, where I tried the DefiningQuery text directly in a SQl Server Management Console query window by adding a where clause for the value I wanted to select for. It run in less than a second. Then I captured the SQL Trace from selecting for the same value from the Entity created for this DefiningQuery and ran the SQL Trace query in a SQL Server query window - it took 13 seconds!</p> <p>So I guess that only real way to do cross database queries is to create a veiw on the server.</p>
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    1. POCan code-first Entity Framework do cross database queries with SQL Server DBs on the same box?
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    1. USChuck Bevitt
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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