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 is any column or set of columns that can be declared as the primary key instead of a real or natural key. Sometimes there can be several natural keys that could be declared as the primary key, and these are all called candidate keys.So a surrogate is a candidate key.