Question

Q.37) Which of the following is not valid unary operation in the relational algebra ? (1
marks )
Ans.
a. project
b. rename
c . select
d. min​

Answer 1

Answer: d. min -> is correct option.

Explanation:

Answer 2

d. min​

Min​ of the following is not valid unary operation in the relational algebra.

• Because they only affect one relation, the select, project, and rename operations are referred to as unary operations. a process with just one input. The square root function is an example. There are numerous additional unary operations, including factorial, sine, cosine, and others.
• the (*) indirection operator Operator's home address ( & ) Unary negation operator (-) and unary plus operator (+) ( - ). In relational algebra, there is no such thing as a manipulate operation.
• The simplest way to represent natural numbers is via the unary numeral system, which uses a symbol for 1 that is repeated N times to indicate a number. The empty string, or lack of a symbol, serves as the unary system's representation of the number 0 (zero).
• A function with only one argument is called a unary function. A unary operator is a subset of unary functions whose range and domain are the same.

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