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.
The final reason I can think of for surrogate keys is one that I strongly suspect but have never proven. Replacing big, ugly natural keys and composite keys with beautiful, tight integer surrogate keys is bound to improve join performance. surrogate key is an artificial or synthetic key that is used as a substitute for a natural key. Actually, a surrogate key in a data warehouse is more than just a substitute for a natural key.