In short
Version-controlled, incremental scripts that evolve your database schema over time — letting a team change table structures safely and reproducibly across environments.
How to learn this
- 1Write a migration that adds a column to an existing table without losing data.
- 2Learn how migration tools track which migrations have already run.
- 3Practice writing both the 'up' (apply) and 'down' (rollback) side of a migration.
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