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The Columns tab of the Primary Key or Unique Constraint property sheet has the following components:
Columns list Shows all the columns in the primary key or unique constraint, as well as their data type, sequence and order (either ascending or descending). You set the order when you create a new index.
The columns are sorted by their sequence, which is a unique number starting at 0. The order of the numbers determines the relative position of the columns in the index.
Details Displays the Column Details dialog, which shows a summary of the properties of the selected column.