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.
To create a primary key in a new table. 1  In Object Explorer, connect to an instance of Database Engine. 2  On the Standard bar, click New Query. 3  Copy and paste the following example into the query window and click Execute. The example creates a table and defines a primary key on the column TransactionID.