# Tuple calculus

<database> A form of relational calculus in which a variable's only permitted values are tuples of a given relation.

Codd's unimplemented language ALPHA and the subsequent QUEL are examples of the tuple calculus.

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tunafish tune tunnelling TUPLE tuple |
relational calculus tuple calculus |
Tuple Space Smalltalk tupling Turbo C Turbo Debugger turbo nerd |