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.
A surrogate key has the following characteristics: 1  The value is never reused and is unique within the whole system. 2  It is system generated. 3  The value cannot be manipulated by the user or application. 4  The value is not an amalgam of different values from multiple domains.