Sql merge output

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OUTPUT Clause ( Transact-SQL ) Returns information from, or expressions based on, each row affected by an INSERT, UPDATE, DELETE, or MERGE statement. These can be returned to the processing application for use in such things as confirmation messages , archiving, and other such application requirements. MERGE ( Transact-SQL ) Performs insert, update, or delete operations on a target table based on the of a join with a source table.

For example, you can synchronize two tables by inserting, updating, or deleting rows in one table based on differences found in the other table. OUTPUT with the MERGE Command The MERGE command allows data to be inserte updated or deleted all within one statement. Because of this, OUTPUT behaves slightly differently. Using the Output Clause with T-SQL Merge. The OUTPUT appears only once, at the end of the MERGE statement.

This functionality greatly increases the power and usefulness of Merge , and is required in the processing of Slowly Changing Dimensions. Logging MERGE Changes using OUTPUT You can use the OUTPUT clause to log any changes. In this case the special variable $action can be used to log the merge action. This variable will take one of three values: “INSERT”, “UPDATE”, or “DELETE”. Examples of Merge Statement’s Output Clause We are using the same tables and merge statement as used in an example previously.

Below are just four simple ways you can use output clause with the merge statement. Martin Smith is right, it is not possible to have two OUTPUT INTO clauses in one MERGE statement, but he is also right that it is possible to have one OUTPUT INTO and one OUTPUT clause. OUTPUT INTO inserts its result set directly into the given table and the simple OUTPUT returns result set to the caller.

It can be used to combine insert, update, and delete operations into one statement. The result from the OUTPUT clause can be inserted into a separate table during the execution of the query. With other statements, the OUTPUT clause lets you refer to only elements from the modified rows.

The MERGE statement provides you with more flexibility than other statements when it comes to the OUTPUT clause. With the MERGE statement, the OUTPUT clause lets you refer to elements from the modified rows, as well as elements from the source table. The SQL Server MERGE command is the combination of INSERT, UPDATE and DELETE commands consolidated into a single statement.

Here is how to get started with the SQL Server MERGE command: Start off by identifying the target table which will be used in the logic. It can work on INSERT, DELETE, UPDATE, and MERGE statements. The entities are compared on Fields which uniquely identify records in each, a Join if you will. In my 18-plus years of T- SQL experience, the MERGE statement has got to be one of the most difficult statements I have had to implement. It is powerful and multifunctional, yet it can be hard to master.

The multi-part identifier S. Target(TargetName) output inserted. SourceID could not be bound. But it is possible with a merge. We can use the OUTPUT clause with DML statements (INSERT, DELETE, UPDATE) to return information from modified rows.

We primarily use the OUTPUT clause for auditing and archiving modified rows. It even supports with a MERGE. By using the OUPUT clause with an INTO option on the MERGE statement you can create an audit trail to show which records were update inserted or deleted. The destination database uses BULK_LOGGED or SIMPLE RECOVERY MODEL.

You insert a large amount of data (for example: around 0rows) into a table in another database. A result set requires more overhead (probably on both sides: in SQL Server to manage the internal cursor, and in the app layer to manage the DataReader object) than a simple OUTPUT parameter.