Business analysts focus on understanding and documenting business needs, translating them into requirements for technology or process changes. Systems analysts focus more on the technical specifications, system architecture, and implementation details. The roles overlap significantly in practice — many job descriptions use the titles interchangeably.

Reference documentation artifacts you've produced: business requirements documents (BRDs), functional specifications, process maps, data flow diagrams, or user stories. Mentioning the project types and scale — 'documented requirements for $2M system migration' — adds context. If your requirements led to successful implementation with minimal change orders, that outcome is worth noting.

Yes — SQL for data validation, report creation, and requirements verification is increasingly expected for BA roles at data-driven organizations. Even basic querying skills may distinguish you from BAs who can only work with pre-built reports. Note the databases and complexity level of queries you're comfortable writing.