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 Oracle SQL Mutating Trigger Error: Solutions and Best Practices
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Oracle database developers often encounter issues with mutating triggers, where the triggering table is updated while being queried. Here are some solutions and best practices to avoid this error:

*   **Compound Triggers**: Split logic into phases (BEFORE, AFTER, etc.) and handle operations after all rows are processed.
*   **Temporary Tables**: Store intermediate results and process them later to avoid direct interaction with the main table.
*   **Autonomous Transactions**: Run separate transactions for queries/modifications outside the scope of the trigger.

Choose the best solution based on your requirements. Compound triggers offer robust and maintainable solutions, while temporary tables and autonomous transactions provide alternative approaches.

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Source: https://dev.to/mrcaption49/solution-to-a-mutating-trigger-error-in-oracle-sql-3pnf