<ul><li>partition_expiration_days in BigQuery allows setting the duration for each partition to exist before automatic deletion.</li><li>It helps in maintaining clean and cost-effective data storage, automating old data deletion, and ensuring compliance with data retention policies.</li><li>The precedence in expiration levels includes partition-level, table-level (partition_expiration_days), and dataset-level default, where manual deletion is required if no expiration is set.</li><li>Expiry can be set at dataset creation or altered using SQL statements for dataset, table, and partition levels in BigQuery.</li></ul>

BigQuery's partition_expiry_days Explained

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