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### 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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### 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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### 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 ...