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Phase 6 · SQL Databases

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Migrations

Part of the Backend Developer Roadmap.

Summary

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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More topics in SQL Databases

Relational Database ConceptsSQL Basics (SELECT, INSERT, UPDATE, DELETE)JoinsIndexesNormalizationTransactionsACID PropertiesPostgreSQLMySQLConstraints & KeysViewsStored ProceduresDatabase Design & ER Diagrams
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