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What is Constraint?
General
Specific requirement that must be met by the value stored in the database. Typical constraints are NOT NULL constraint, UNIQUE constraint and etc.
Safer and faster database change and version control for DBAs and Developers

Bytebase is an open source, web-based database schema change and version control tool for teams. It offers a web-based collaboration workspace to help DBAs and Developers manage the lifecycle of application database schemas.