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“
■ Types are (sets of) things we can talk about.
■ Relations are (sets of) things we say about the things we can talk about.
(There is a nice analogy here that might help you appreciate and remember these important points: Types are to relations as nouns are to sentences.) Thus, in the example, the things we can talk about are employee numbers, names, department numbers, and money values, and the things we say are true utterances of the form “The employee with the specified employee number has t
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― An Introduction to Database Systems
― An Introduction to Database Systems
“
I'm an oracle of the past. I can accurately predict up to 1 minute in the future, by thoroughly investigating the last 2 years of your life. Also, I look like an old database – flat and full of useless info.
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― Nothing is here...
― Nothing is here...
