How to add Primary key into a New or Existing Table in SQL Server? Example

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To add a primary key to an existing table in SQL Server, you can use the ALTER clause of SQL.
Sometimes tables lack a primary key due to a lack of a column that is both NOT NULL and UNIQUE.
Identity columns can be used as a primary key if there is no suitable column in the table.
Composite primary keys can be created by combining multiple columns.

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