ORA-01731: circular view definition encountered

oracle

ORA-01731: circular view definition encountered
Cause: Through a series of CREATE and DROP VIEW statements, a view was defined that refers to itself. For example, VIEW1 might include a column from VIEW2 that is defined as a column in VIEW1. View definitions may be seen by querying the data dictionary.
Action: Check the view definitions, remove any circular references, and retry the statements.

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