Mikhail Gorbachev's policies of glasnost and perestroika had profound and unintended effects on the Soviet Union. In fact, many historians suggest these reforms led directly to the fall of communism and the breakup of the Soviet Union.
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. When you use a natural key as a table's primary key, each of the table's rows is uniquely identified.
Usually, when the data warehouse administrator encounters a changed description in a dimension record such as product or customer, the correct response is to issue a new dimension record. But to do this, the data warehouse must have a more general key structure. Hence the need for a surrogate key. There are still more reasons to use surrogate keys.