MERGE statement

SELECT COUNT(*) [primary] FROM primaryserver.database.dbo.table
SELECT COUNT(*) [redundancy] FROM dbo.table
SELECT COUNT(*) [missing] FROM (SELECT pkfield,uniqueidxfield1,uniqueidxfield2,uniqueidxfield3,uniqueidxfield4
	 FROM primaryserver.database.dbo.table
	 EXCEPT
	 SELECT pkfield,uniqueidxfield1,uniqueidxfield2,uniqueidxfield3,uniqueidxfield4
	 FROM dbo.table) X
SELECT COUNT(*) [orphans] FROM (SELECT pkfield,uniqueidxfield1,uniqueidxfield2,uniqueidxfield3,uniqueidxfield4
	 FROM dbo.table 
	 EXCEPT
	 SELECT pkfield,uniqueidxfield1,uniqueidxfield2,uniqueidxfield3,uniqueidxfield4
	 FROM primaryserver.database.dbo.table) X	 
 
SET IDENTITY_INSERT dbo.table ON
--Synchronize the target table with refreshed data from source table
MERGE dbo.table AS TARGET
USING primaryserver.database.dbo.table AS SOURCE 
ON (TARGET.pkfield = SOURCE.pkfield) 
--When records are matched, update the records if there is any change
WHEN MATCHED AND TARGET.uniqueidxfield1 <> SOURCE.uniqueidxfield1 OR TARGET.uniqueidxfield2 <> SOURCE.uniqueidxfield2 
OR TARGET.uniqueidxfield3 <> SOURCE.uniqueidxfield3 OR TARGET.uniqueidxfield4 <> SOURCE.uniqueidxfield4
OR .......the remaining updateable attributes
THEN UPDATE 
SET TARGET.uniqueidxfield1=SOURCE.uniqueidxfield1,TARGET.uniqueidxfield2=SOURCE.uniqueidxfield2,TARGET.uniqueidxfield3=SOURCE.uniqueidxfield3,
TARGET.uniqueidxfield4=SOURCE.uniqueidxfield4,.......the remaining updateable attributes
--When no records are matched, insert the incoming records from source table to target table
WHEN NOT MATCHED BY TARGET THEN 
INSERT (pkfield,uniqueidxfield1,uniqueidxfield2,uniqueidxfield3,uniqueidxfield4,.......remaining attributes) 
VALUES (SOURCE.pkfield,SOURCE.uniqueidxfield1,SOURCE.uniqueidxfield2,SOURCE.uniqueidxfield3,SOURCE.uniqueidxfield4,.......remaining attributes)
--When exists in target table but not source table then delete this record from target table
WHEN NOT MATCHED BY SOURCE THEN
DELETE
--$action specifies a column of type nvarchar(10) 
--in the OUTPUT clause that returns one of three 
--values for each row: 'INSERT', 'UPDATE', or 'DELETE', 
--according to the action that was performed on that row
OUTPUT $action, 
DELETED.pkfield AS TargetQHID, 
DELETED.uniqueidxfield1 AS Targetuniqueidxfield1, 
DELETED.uniqueidxfield2 AS Targetuniqueidxfield2, 
DELETED.uniqueidxfield3 AS Targetuniqueidxfield3,
DELETED.uniqueidxfield4 AS Targetuniqueidxfield4,
INSERTED.pkfield AS SourceQHID, 
INSERTED.uniqueidxfield1 AS Sourceuniqueidxfield1, 
INSERTED.uniqueidxfield2 AS Sourceuniqueidxfield2,
INSERTED.uniqueidxfield3 AS Sourceuniqueidxfield3,
INSERTED.uniqueidxfield4 AS Sourceuniqueidxfield4; 
SELECT @@ROWCOUNT;
SET IDENTITY_INSERT dbo.table OFF;
 
SELECT COUNT(*) [primary] FROM primaryserver.database.dbo.table
SELECT COUNT(*) [redundancy] FROM dbo.table
SELECT COUNT(*) [missing] FROM (SELECT pkfield,uniqueidxfield1,uniqueidxfield2,uniqueidxfield3,uniqueidxfield4
	 FROM primaryserver.database.dbo.table
	 EXCEPT
	 SELECT pkfield,uniqueidxfield1,uniqueidxfield2,uniqueidxfield3,uniqueidxfield4
	 FROM dbo.table) X
SELECT COUNT(*) [orphans] FROM (SELECT pkfield,uniqueidxfield1,uniqueidxfield2,uniqueidxfield3,uniqueidxfield4
	 FROM dbo.table 
	 EXCEPT
	 SELECT pkfield,uniqueidxfield1,uniqueidxfield2,uniqueidxfield3,uniqueidxfield4
	 FROM primaryserver.database.dbo.table) X	 
                                              

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