Practical PostgreSQL for Developers Who Have Only Used MySQL — Learn by Reproducing MVCC, VACUUM, Execution Plans, and Indexes Hands-On

If you’ve built services with MySQL, run the same SQL side by side on MySQL 8.4 and PostgreSQL 17 to verify 40 differences firsthand using executable examples—from UPDATEs that make tables four times larger, different default isolation levels, 40001 serialization errors, and locking without gap locks to tree-shaped execution plans and partial, GIN, and BRIN indexes.