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A. The Relational Model > DATABASE VARIABLES

DATABASE VARIABLES

Note: This section consists of a revised version of material from Appendix D (“What Is a Database?”) from the book Databases, Types, and the Relational Model: The Third Manifesto, by Hugh Darwen and myself (see Appendix G).

I mentioned in the previous section that databases are really variables (as I said in that section, if a database can be updated, then it’s a variable by definition). In other words, we can draw a distinction between database values and database variables, precisely analogous to the one we already draw between relation values and relation variables. As a matter of fact, we—i.e., Darwen and myself—did draw exactly such a distinction in the first version of The Third Manifesto. Here’s an edited quote:


  

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