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WHEN MATCHED THEN <merge_matched>
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Specifies that a row be inserted into the target table if a matched row is not found and if any additional conditions defined in the WHEN NOT MATCHED [BY TARGET] clause. Only one WHEN NOT MATCHED [BY TARGET] clause may exist in a MERGE statement.
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WHEN NOT MATCHED [BY TARGET] THEN <merge_not_matched> WHEN NOT MATCHED BY SOURCE THEN <merge_matched>
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Defines an UPDATE or DELETE action on rows that exist in the target table but not in the source. Like the WHEN MATCHED clause, a MERGE statement can include up to two WHEN NOT MATCHED BY SOURCE clauses, and when two exist, one must be defined as an UPDATE and the other is defined as a DELETE. When no rows are returned by the source table, columns in the source table cannot be referenced in the <merge_matched> clause or an error 207 (invalid column name) is returned.
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Lesson 2: Enhancing DML Functionality with the OUTPUT Clause and MERGE Statement CHAPTER 2 61
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MERGE Statement Samples
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A common merge scenario is moving data from one table to another. For example, suppose that a company needs to copy information from the SalesOrderDetail table in the AdventureWorks2008 database to the SalesOrderDetailHistory table. The SalesOrderDetailHistory table includes a column called Cancelled in addition to the columns defined in the SalesOrderDetail table. Instead of using timestamps or some other method to identify what rows have changed since the last time information was moved, the MERGE statement can compare the two tables and insert only new rows, rather than having to insert all rows or maintaining Timestamp columns. The use of CDC makes this process even more efficient. The MERGE statement here inserts any new rows into the SalesOrderDetailHistory table and adds a value of True to the Cancelled column for any rows that no longer exist in the source table. Because business rules and data constraints prohibit updates to the SalesOrderDetails table, row modifications are not checked or propagated:
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MERGE INTO Sales.SalesOrderDetailHistory AS SODH USING Sales.SalesOrderDetail AS SOD ON SODH.salesorderid = SOD.salesorderid AND SODH.SalesOrderDetailID = SOD.SalesOrderDetailID WHEN NOT MATCHED BY TARGET THEN INSERT (Linetotal, SalesOrderID, SalesOrderDetailID, CarrierTrackingNumber, OrderQty , ProductID, SpecialOfferID, UnitPrice, UnitPriceDiscount , rowguid, ModifiedDate, Cancelled) VALUES (Linetotal, SalesOrderID, SalesOrderDetailID, CarrierTrackingNumber, OrderQty , ProductID, SpecialOfferID, UnitPrice, UnitPriceDiscount , rowguid, ModifiedDate,DEFAULT) WHEN NOT MATCHED BY SOURCE THEN UPDATE SET SODH.Cancelled = 'True';
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You can use the OUTPUT clause in conjunction with the $action variable to report information on whether inserts, updates, or deletes were performed during the execution of the MERGE statement, as shown in Figure 2-1. Pr actice
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implementing extended DML Functionality
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In this practice, you use the OUTPUT clause to report the before and after states of the quantity column when a row is updated in the SalesOrderDetail table. You also use the MERGE statement in conjunction with the OUTPUT clause to maintain information in a SalesOrderDetailHistory table and track changes performed by the MERGE statement in the MergeAudit table.
e xercise 1
Use the OUTPUT Clause
In this exercise, you test a script that uses the OUTPUT clause to build a table variable with information determined by the results of an UPDATE command. You perform this update as part of a transaction so that you can roll back changes after the test has been successfully completed. Transactions are covered in detail in Lesson 3, later in this chapter.
Modifying Data The INSERT, UPDATE, DELETE, and MERGE Statements
FiGURe 2-1 Results of running the OUTPUT $action clause
1. 2.
If necessary, start SSMS, connect to your SQL Server instance, and open a new query window. In the new query window, type and execute the following command to declare a table type variable, update a row in the SalesOrderDetail table, and output the results to the table variable:
USE AdventureWorks2008;
BEGIN TRANSACTION;
DECLARE @testoutput TABLE (SalesOrderID int, SalesOrderDetailID int , QtyBefore int, QtyAfter int , ModifiedDate datetime2, UserNmae varchar(30)) UPDATE Sales.SalesOrderDetail SET OrderQty = 2 OUTPUT inserted.SalesOrderID, inserted.SalesOrderDetailID , deleted.OrderQty, inserted.OrderQty , GETDATE(), SUSER_SNAME() INTO @testoutput WHERE SalesOrderID = 43659 and SalesOrderDetailID = 1;
SELECT * FROM @testoutput;
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