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For example, inserting a row if it does not exist, or updating the row if it does match.
When simply updating one table based on the rows of another table, improved performance and scalability can be achieved with basic INSERT, UPDATE, and DELETE statements.
Avoid using this feature in new development work, and plan to modify applications that currently use this feature.
For example: Specifies the temporary named result set or view, also known as common table expression, defined within the scope of the MERGE statement.
The result set is derived from a simple query and is referenced by the MERGE statement.
The rows referenced in the TOP expression are not arranged in any order. The TOP clause is applied after the entire source table and the entire target table are joined and the joined rows that do not qualify for an insert, update, or delete action are removed.
The TOP clause further reduces the number of joined rows to the specified value and the insert, update, or delete actions are applied to the remaining joined rows in an unordered fashion.