The SQLSeal plugin enables Obsidian users to transform CSV files in their vault into SQL databases for advanced querying. By creating sqlseal code blocks, users can define tables based on CSV files and execute SQL statements like SELECT, providing powerful data manipulation and analysis capabilities directly within Obsidian. Multiple tables can be defined in a single snippet, and tables remain local to the note for efficient organization. This plugin is ideal for managing and querying structured data within a vault, seamlessly integrating database functionality into the note-taking environment.