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Exposed locators such as IDENTITY are not surrogate keys.

A surrogate is totally hidden from users and maintained by the system -- think of how an index works.

For example, you can use the MERGE statement to perform the following operations: It is important to understand how the source and target data are merged into a single input stream and how additional search criteria can be used to correctly filter out unneeded rows.

Otherwise,you might specify the additional search criteria in a way that produces incorrect results.

When you use a natural key as a table's primary key, each of the table's rows is uniquely identified.

I addressed this concept in SQL by Design, "How to Choose a Primary Key," April 1999, but sometimes a topic is important enough to revisit.

Drop all but one of the dups and then try to find all of the referenced rows in other tables. It does not matter if you used an autonumber or the UPC, the UPC has to be updated.

SQL Server allows for creating multiple triggers for any specific statement.

In SQL Server, you create a surrogate key by assigning an identity property to a column that has a number data type.

A natural key is a naturally occurring descriptor of the data and one of a table's attributes that has no duplicate values.

To illustrate, consider the following example source and target tables and data. Target(Employee ID int, Employee Name varchar(10), CONSTRAINT Target_PK PRIMARY KEY(Employee ID)); CREATE TABLE dbo.

Source(Employee ID int, Employee Name varchar(10), CONSTRAINT Source_PK PRIMARY KEY(Employee ID)); GO INSERT dbo.

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