Model a Unique Constraint

Unique constraints are a combination of values (represented by Table columns) that uniquely identify a row in the Table.

Access     Tools | Database Builder | Click on Table name > Constraints | Right-click | Add New Constraint (Ctrl+N)

 

A new constraint is added to the Constraints tab, with the default type index. Click on the drop-down arrow and select unique. See the Help topic Unique Constraints for information on defining the new constraint.

To delete a unique constraint you no longer require, right-click on the constraint name on the Constraints tab and select the Delete constraint <name> option. The constraint is immediately removed.

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