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TOP ( can be either a number or a percentage of the rows.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.

Because the MERGE statement performs a full table scan of both the source and target tables, I/O performance can be affected when using the TOP clause to modify a large table by creating multiple batches.Performs insert, update, or delete operations on a target table based on the results 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.The result set is derived from a simple query and is referenced by the MERGE statement.For more information, see WITH common_table_expression (Transact-SQL).

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