Relational databases with SQL—design schemas, write queries, aggregate data, and support applications and analytics.
Reporting, app backends, data warehousing feeds, and the foundation for Python/R/BI tools that query databases.
SQL developer, data analyst, database administrator (junior), back-end support, analytics engineer.
SQL is the shared skill under web apps, BI, and data science—we teach it as the single source of truth for structured data.