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ZelWiki.Repository/Scripts/PurgeOrphanedPageAttachments.sql

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+BEGIN TRANSACTION;
+
+--Delete orphaned PageFileRevision.
+DELETE FROM PageFileRevision
+WHERE (PageFileId, Revision) IN (
+    SELECT
+        PFR.PageFileId,
+        PFR.Revision
+    FROM
+        PageFileRevision as PFR
+    INNER JOIN PageFile as PF
+        ON PF.Id = PFR.PageFileId
+    INNER JOIN Page as P
+        ON P.Id = PF.PageId
+    LEFT OUTER JOIN PageRevisionAttachment as PRA
+        ON PRA.PageFileId = PFR.PageFileId
+        AND PRA.FileRevision = PFR.Revision
+    WHERE
+        PRA.PageFileId IS NULL
+);
+
+--Delete orphaned PageFile.
+DELETE FROM PageFile
+WHERE Id NOT IN (SELECT PageFileId FROM PageFileRevision);
+
+COMMIT TRANSACTION