I acquired a crucial skill: Structured Query Language (SQL), after relying solely on Object-Relational Mappers (ORMs) in my previous projects.

To guide my learning, I completed the 15 Days of SQL course by Nikolai Schuler. I’m sharing my journey and practices here as a reference point, both for myself and anyone who may find it helpful.

The files inside the /Commands folder contain my learning progress, from day 2 to day 15, gradually moving from basic to advanced concepts.

The pagila-master.zip and flight_database.zip files include SQL scripts for building the databases used throughout the course. These are PostgreSQL-based, and you can build them in PGAdmin's Query Tool by running pagila-insert-data.sql and flight_database.sql after extracting the contents from the zip files.

Starting from day 5, the commands alternate between the two databases within the same file. If you find switching between databases inconvenient, feel free to reorganize the commands. I left them in the original sequence as that reflects the natural progression of my learning.