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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

What this migration involves

Moving from MySQL to PostgreSQL is rated hard and takes about 8-20h on a typical project. The guide breaks it into 6 steps, 1 of which ship with runnable commands and 1 with a verification check.

FAQ

How long does migrating from MySQL to PostgreSQL take?

Around 8-20h for a typical project — 6 steps, difficulty rated hard, 1 of them with copy-paste commands.

Is moving from MySQL to PostgreSQL reversible?

No reverse guide is tracked yet, so treat this as a one-way move and keep a full export of your MySQL data before you start.

What does PostgreSQL cost compared to MySQL?

Pricing for both tools is contact-based or not tracked yet.