Learning resources Microsoft Virtual Academy Channel 9 MSDN Magazine Community Forums Blogs Codeplex Support Self support Programs BizSpark (for startups) Microsoft Imagine (for students) United States (English) Newsletter Privacy & cookies Transact-SQL Copy USE tempdb; GO CREATE TABLE dbo.Target(EmployeeID int, EmployeeName varchar(10), CONSTRAINT Target_PK PRIMARY KEY(EmployeeID)); CREATE TABLE dbo.Source(EmployeeID int, EmployeeName varchar(10), CONSTRAINT Source_PK PRIMARY KEY(EmployeeID)); GO INSERT dbo.Target(EmployeeID, EmployeeName) VALUES(100, 'Mary'); In this example, Purchases contains purchases for the week of August 21, 2006. When you're done, run the following code for cleanup: IF OBJECT_ID('Sales.MyCustomers') IS NOT NULL DROP TABLE Sales.MyCustomers; Use MERGE Effectively The MERGE statement was introduced in SQL Server 2008. Source
Transact-SQL Copy USE AdventureWorks2008R2; GO IF OBJECT_ID (N'dbo.Purchases', N'U') IS NOT NULL DROP TABLE dbo.Purchases; GO CREATE TABLE dbo.Purchases ( ProductID int, CustomerID int, PurchaseDate datetime, CONSTRAINT PK_PurchProdID PRIMARY KEY(ProductID,CustomerID)); GO This happens when a target row matches more than one source row. Copyright © 2002-2016 Redgate. Depending on the WHEN clauses specified in the statement, the input row might be any one of the following:A matched pair consisting of one row from the target and one from https://technet.microsoft.com/en-us/library/bb522522(v=sql.105).aspx
This is accomplished in the WHEN NOT MATCHED THEN clause.Any departments in Departments that do not exist in the source table Departments_delta are deleted from Departments. This method is similar to specifying additional search criteria in the ON clause and may produce incorrect results. I'll first demonstrate using table operators such as joins, and then I'll demonstrate using table functions. Sql Server Merge Example You cannot delete your own topics.
This is usually done by passing parameters to a stored procedure that contains the appropriate UPDATE and INSERT statements. Refine The On Clause To Ensure A Target Row Matches At Most One Source Row If yes, then your source table might be very big and going through constant changes (INSERT/UPDATE/DELETE), which might be causing PAGE-SPLITS and causing to read single source row TWICE. Refine the ON clause to ensure a target row matches at most one source row, or use the GROUP BY clause to group the source rows.Regards,Vipin Jha Post #1667882 Phil ParkinPhil The result is a combined input stream.
Print reprints Favorite EMAIL Tweet Discuss this Article 2 sabdula on Sep 5, 2012 answer for my guestion: it is possible to use CTE but in this case, changes do not Merge Statement In Oracle How to construct a 3D 10-sided Die (Pentagonal trapezohedron) and Spin to a face? In a join, the ON clause is used for both matching and filtering purposes. Snider.
expression can be either a number or a percentage of the rows. Inserting the results of the MERGE statement into another tableThe following example captures data returned from the OUTPUT clause of a MERGE statement and inserts that data into another table. The Same Row Of Target Table Was Identified More Than Once For An Update One thing I will suggest is that you write a query with a GROUP BY and HAVING COUNT(*)>1 on the base dataset, where the GROUP BY is the list of columns Sql Error 8672 The Procedure returns a count of how many records were affected during the processing. */ BEGIN TRY --Declare @InsertedCount int, @DeletedCount int, @UpdatedCount int, @ProcessedCount int Declare @LoadingDate datetime, @ExpiredDate datetime,
I cover four main tips: preventing MERGE conflicts, understanding that the MERGE ON clause isn't a filter, realizing that the MERGE USING clause is like the FROM clause in a SELECT http://cpresourcesllc.com/sql-server/sql-server-raiserror.php For those rows, we update FactBuyingHabits with the date recorded for those purchases in Purchases by using the WHEN MATCHED THEN clause. The example captures the rows that are updated and inserts them into another table that is used to track inventory changes. In a MERGE statement, the ON clause is used to identify matches and nonmatches and to accordingly determine which WHEN clause to activate. This Happens When A Target Row Matches More Than One Source Row
Did the page load quickly? Cheers :) Sourav Thursday, September 10, 2015 - 3:46:06 AM - SVS Sudheer Back To Top This tip helps me. For example: Copy INSERT tbl_A (col, col2) SELECT col, col2 FROM tbl_B WHERE NOT EXISTS (SELECT col FROM tbl_A A2 WHERE A2.col = tbl_B.col); Transact-SQL Syntax ConventionsSyntax Copy [ WITH
The MERGE statement updates the Quantity column of the ProductInventory table in the AdventureWorks2012 database, based on orders that are processed in the SalesOrderDetail table. Sql Server Merge Performance We recommend that you avoid using this method or test thoroughly before implementing it.ExamplesA. If it doesn't exist, you end up inserting a row that you're not supposed to into the target.
The following example demonstrates how incorrect results can occur. Do you want to set the Address to the first of the values from the source table? You cannot edit other events. When Not Matched By Source Then Delete no history is kept).
Post #1667883 LinksUpLinksUp Posted Thursday, March 12, 2015 12:29 AM Say Hey Kid Group: General Forum Members Last Login: Today @ 8:58 AM Points: 692, Visits: 3,791 vipin_jha123 (3/12/2015)Hi ,Msg 8672, Linked 0 SQL Merge Error : The MERGE statement attempted to UPDATE or DELETE 0 Error message having to do with merge, but it's not a merge Related 871How to perform We insert all other rows into FactBuyingHabits by using the WHEN NOT MATCHED THEN clause. Check This Out All Rights Reserved.
For more information about updating data by using a view, see Modifying Data Through a View.Use the WITH
To make matters more confusing breaking the logic out into a separate UPDATE statement and executing that alone succeeds, however querying the target and source again show that no change was Milan Das Wednesday, August 05, 2015 4:46 PM Reply | Quote 0 Sign in to vote The MERGE statement attempted to UPDATE or DELETE the same row more than once. .. TV episode or movie where people on planet only live a hundred days and fall asleep at prescribed time Steam Download on one machine, play on another machine using the same You get the error message in Figure 3.
As stated earlier, the WHEN clauses specify the actions to take based on the results of the ON clause and any additional search criteria specified in the WHEN clauses. Performing INSERT, UPDATE, and DELETE operationsThe following example uses MERGE to insert, update, or delete rows in a target table based on differences with the source data. You may download attachments. We recommend following these guidelines:Specify only search conditions in the ON
The complete T-SQL MERGE statement is shown in the box below. -- begin of insert using merge insert into dbo.tblDimSCDType2Example ( --Table and columns in which to insert the data SourceID1, In the following example, the filtering conditions are applied to the WHEN NOT MATCHED BY TARGET and the WHEN NOT MATCHED BY SOURCE. Now that the input stream results are known, consider how the insert, update, and delete actions will be applied to the input stream. Transact-SQL Copy -- MERGE statement with join conditions that produce unexpected results.
There might NO DUPLICATES, but you might be using NOLOCK hint? Yes No Additional feedback? 1500 characters remaining Submit Skip this Thank you! In this article, I discuss some tips concerning the MERGE statement that I discovered after several years of working with the statement. Here's an example of how you can achieve this with a CTE: WITH SRC AS ( SELECT custid, companyname, country, phone FROM Sales.Customers WHERE country = N'Italy' ) MERGE INTO Sales.MyCustomers
Transact-SQL Copy USE AdventureWorks2008R2; GO IF OBJECT_ID (N'dbo.Purchases', N'U') IS NOT NULL DROP TABLE dbo.Purchases; GO CREATE TABLE dbo.Purchases ( ProductID int, CustomerID int, PurchaseDate datetime, CONSTRAINT PK_PurchProdID PRIMARY KEY(ProductID,CustomerID)); GO Rather, you can refer to table expressions, table functions, and even use table operators such as JOIN, APPLY, PIVOT, and UNPIVOT.