The relational database is a combination of the Master spreadsheet table and all of its Slave tables or spreadsheets. For example, your driver’s license is a single record in a flat-file ...

In this paper, the authors describe a custom relational algebra query software environment that enables database instructors ... be in any Microsoft Access MDB file. The query processor software ...

none of which lend themselves to relational algebra, and you really don’t need transactions here. The file system is fine, and metadata would be better off in document database. 9. Classified ...