PostgreSQL vs MySQL

The two most popular open-source databases.

PostgreSQL:

• More SQL standard compliant
• Better for complex queries
• JSONB for semi-structured data
• Used at: Apple, Instagram, Spotify

MySQL:

• Faster for simple reads
• Easier to set up
• Popular with PHP/WordPress
• Used at: Facebook, Twitter, Netflix

Key syntax differences:

• String concat: || (Postgres) vs CONCAT() (MySQL)
• LIMIT: Both support LIMIT
• UPSERT: ON CONFLICT (PG) vs ON DUPLICATE KEY (MySQL)
• Arrays: Postgres has them, MySQL doesn't

Both are excellent choices!