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.