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How to get the values that are repeated in an attribute of a relation? [closed]

So I have a relation: Cars(model, passenger) The models are all unique, let's say, {A, B, C, D, E}. Passengers is just the capacity of the car (any positive non-zero integer), let's say ...
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4answers
925 views

Math behind databases management and SQL ?

Are there some mathematical theories/theorems/... behind modern development of database management systems and in particular of SQL ? I am refreshing my knowledge of these things which are quite ...
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3answers
1k views

Higher categories as data structures

Still wading through higher category theory. I find the subject a bit intimidating, not so much for technical reasons, but because I lack sufficient intuition as to the motivation(s)/heuristics one ...
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0answers
241 views

Surveys of relational algebra and calculus

Can anyone point me to short survey articles of mathmatical expositions of Codd's relational algebra and calculus (from database theory)? I suspect there's some straightforward categorical ...