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FLVS is an online school dedicated to personalized learning.In addition, if you create a composite primary key (more than one column), the individual columns can contain duplicate values, but the columns collectively cannot and together must provide the unique identifiers for each row.For example, the table When you create a primary key, SQL Server automatically creates an index based on the key columns.For example, a primary key is often made up of a single column.Regardless of how many values are repeated in other columns, the primary key values are always unique and consequently ensure that each row can be identified separately from all other rows.

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A primary key provides a mechanism for ensuring that the rows in a table are unique.

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