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Correct notes on BQ constraint definition and enforcement. #4679

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Expand Up @@ -300,7 +300,7 @@ select

<div warehouse="BigQuery">

BigQuery allows defining `not null` constraints. However, it does _not_ support or enforce the definition of unenforced constraints, such as `primary key`.
BigQuery allows defining and enforcing `not null` constraints, and defining (but _not_ enforcing) `primary key` and `foreign key` constraints (which can be used for query optimization). BigQuery does not support defining or enforcing other constraints. For more information, refer to [Platform constraint support](/docs/collaborate/govern/model-contracts#platform-constraint-support)

Documentation: https://cloud.google.com/bigquery/docs/reference/standard-sql/data-definition-language

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