Compliance requires that every payment amount be non-negative. An engineer runs the statement below on a Delta table that already holds millions of historical rows, including negative refunds imported from a legacy migration: ```sql ALTER TABLE catalog.finance.payments ADD CONSTRAINT chk_amount CHECK (amount >= 0); ``` What is the outcome of this statement, and why?
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Correct answer: It fails — ADD CONSTRAINT verifies every existing row against the CHECK, and the negative rows block it until they are corrected or removed
Reference: https://docs.databricks.com/aws/en/tables/constraints
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02 — The Myelin Layer · Canonical Discussion
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Official Answer (D): It fails — ADD CONSTRAINT verifies every existing row against the CHECK, and the negative rows block it until they are corrected or removed
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