ERROR: Columns ... contain duplicate keys in table ...

Reason:

You attempted to create a unique constraint using create_unique_constraint() on a table but one or more rows contain duplicate keys in the table.

Resolution:

Ensure you specify columns that do not contain duplicate keys.

Tips:

  • Were the correct columns specified for the unique constraint?
  • Does the table contain invalid data?
  • Does the table need truncating and re-loading with valid data?
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