Introduced UniqueKeyIndex

The `UniqueKeyIndex` view is intended to aid in internal diagnostics. It provides a mapping of `TopicID` to fully-qualified `UniqueKey` values by materializing the path of the nested set. It is not a fast view, and should not be relied upon for production purposes.

Author: JeremyCaney

OnTopic.Data.Sql.Database/OnTopic.Data.Sql.Database.sqlproj

@@ -81,6 +81,7 @@
     <Build Include="Utilities\Stored Procedures\DeleteOrphanedLastModifiedAttributes.sql" />
     <Build Include="Utilities\Stored Procedures\DeleteConsecutiveAttributes.sql" />
     <Build Include="Utilities\Stored Procedures\ConsolidateVersions.sql" />
+    <Build Include="Views\UniqueKeyIndex.sql" />
   </ItemGroup>
   <ItemGroup>
     <Build Include="Tables\ExtendedAttributes.sql" />

OnTopic.Data.Sql.Database/Views/UniqueKeyIndex.sql

@@ -0,0 +1,35 @@
+--------------------------------------------------------------------------------------------------------------------------------
+-- UNIQUE KEY (INDEX)
+--------------------------------------------------------------------------------------------------------------------------------
+-- Generates a view mapping each TopicID to its UniqueKey.
+--------------------------------------------------------------------------------------------------------------------------------
+CREATE
+VIEW	[dbo].[UniqueKeyIndex]
+WITH	SCHEMABINDING
+AS
+
+SELECT          Tree.TopicID,
+                Path = Replace(Path, '>', ':')
+FROM            [dbo].[Topics] Tree
+CROSS APPLY (
+  SELECT        Path = Stuff((
+    SELECT      '>' + AttributeValue
+    FROM (
+      SELECT    RangeLeft,
+                AttributeValue
+      FROM      [dbo].[Topics]
+      CROSS APPLY (
+        SELECT  TOP 1
+                AttributeValue
+        FROM    [dbo].[Attributes]
+        WHERE   Attributes.TopicID = Topics.TopicID
+        AND     Attributes.AttributeKey = 'Key'
+        ORDER BY Version DESC
+      ) AttributeValue
+      WHERE     Tree.RangeLeft BETWEEN RangeLeft AND RangeRight
+    ) B1
+    ORDER BY    RangeLeft
+    FOR XML Path ('')
+  )
+  ,1,4,'')
+) UniqueKeyIndex