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What is the arity of a query in databases? for a realtion is the number of attributes. Is it the number of attributes in all the input relations, or number of attributes of the new query output relation? for eg. Input: a database D, a query Q/k ∈ L, a tuple of constants t∈ adom(D)^k, where L is the language. Thanks

Studentguy
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  • What have you found so far, what do you think and why? This is not an homework service, sorry. – dparoli Feb 20 '19 at 15:18
  • Im confused between the number of attributes that the all the input tables, and the number of attributes of the output table – Studentguy Feb 20 '19 at 15:32

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