<ul><li>Flask is a lightweight web framework written in Python, known for its extensibility and flexibility.</li><li>Constraints in Flask with SQLAlchemy are rules applied to table columns to ensure data integrity and validity.</li><li>Commonly used constraints include nullable (to disallow NULL values) and unique (to enforce unique values).</li><li>Validations in Flask with SQLAlchemy are automatic checks that ensure sensible and feasible data entry.</li></ul>

A beginners guide to Constraints and Validations in Flask, SQLAlchemy

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