You check `EXPLAIN` during code review and find no slow queries, yet in production, hundreds of SQL statements are being executed. This is the N+1 problem. Even if your index design is correct, ...

End-to-end MySQL Business Intelligence project using the Brazilian Olist dataset featuring ETL, data cleaning, SQL analytics, views, stored procedures, triggers, indexing, and query optimization. - ...

PostgreSQL is a free, open-source, ACID-compliant relational database. It is the database of choice for a large share of new applications because it is reliable, deeply featureful, standards-compliant ...