Specifying a unique ID database column
PingFederate uses the database column you specify on the Unique ID tab to check whether a user record already exists for the incoming single sign-on (SSO) token.
About this task

This tab only appears if you have chosen a Microsoft SQL Server datastore on the User Repository tab and you selected the Table option on the SQL Method tab. |
Steps
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Select a column that represents a unique characteristic about the database entry for a particular user.