How to: Set a Data Column as the Primary Key
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How to: Set a Data Column as the Primary Key 

Setting a data column as the primary key guarantees that each record contains a unique value. Only one primary key can be assigned to a data table. You create a primary key in a data table using the Dataset Designer.

To set a data column to be the primary key in a data table

  1. Open your dataset in the Dataset Designer.

  2. Right-click the column you want to set as the primary key. Click Set Primary Key.

    A key icon appears next to the selected column(s).

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