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Home / Migrations / MySQL → PostgreSQL

MySQL → PostgreSQL

hard

PostgreSQL is more standards-compliant, has better JSON support, window functions, and a richer extension ecosystem. Moving from MySQL requires schema and query adjustments.

Estimated: 8-20h · 6 steps

Progress0%

Step 1: Audit MySQL-specific features

List all places using: AUTO_INCREMENT, ENUM types, FULLTEXT indexes, MySQL functions (IFNULL, GROUP_CONCAT, DATE_FORMAT).

Step 2: Use pgloader for initial migration

pgloader handles most MySQL→PostgreSQL schema and data conversion automatically.

pgloader mysql://user:pass@localhost/mydb postgresql://user:pass@localhost/mydb

Step 3: Fix schema differences

AUTO_INCREMENT → SERIAL/GENERATED. tinyint(1) → boolean. DATETIME → TIMESTAMP WITH TIME ZONE. Backticks → double quotes.

Step 4: Fix queries

IFNULL → COALESCE. GROUP_CONCAT → STRING_AGG. LIMIT x,y → LIMIT y OFFSET x. Stricter GROUP BY (must include all non-aggregated columns).

Step 5: Update ORM config

Prisma: change provider to 'postgresql'. Drizzle: switch to pg dialect. Sequelize: change dialect option.

Step 6: Test thoroughly

✓ All queries return correct results, transactions work, performance acceptable