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Who is one is not unary operation in relational algebra?

Who is one is not unary operation in relational algebra? Correct Answer Union

Procedural query language - 4 Relational algebra ব্যবহৃত হয়। এটি বিভিন্ন ভাগে ভাগ করা যায়।

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The Coordinator of an International Virtual Conference has planned six guest lectures on different areas-Cryptography, Fluid Dynamics, Big Data Analysis, Wavelet Theory, Differential Equations and Linear Algebra-to be organised only one on each day from Monday to Sunday.  Wavelet Theory should be organised immediately after Differential Equations.  Big Data Analysis should be organised on Wednesday and should not be followed by Linear Algebra.  Fluid Dynamics should be organised on Friday and there should be a gap of two days between Cryptography and Linear Algebra.  One day there will be no lecture (Saturday is not that day), and just before that day Linear Algebra will be organised. How many lectures are organised between Big Data Analysis and Wavelet Theory? 
"Algebraic thinking involves generalisation and symbolisation". Which of the following explains the meaning of the given statement? (a) Algebraic equations are solved by using mathematical symbols hence these symbols should be memorized (b) Algebra involves the process of creating generalizations from arithmetic (c) Algebra involves representing patterns and regularities in our world (d) Algebra is more abstract and symbolic hence cannot be taught through concrete experiences Choose the correct option.
The figure shows a shape ABC and its mirror image A1B1C1 across the horizontal axis (X-axis). The coordinate transformation matrix that maps ABC to A1B1C1 is
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Consider the relational schema given below, where eId of the relation dependent is a foreign key referring to empId of the relation employee. Assume that every employee has at least one associated dependent in the dependent relation. Employee (empId, empName, empAge) Dependent(depId, eId, depName, depAge) Consider the following relational algebra query: ΠempId(employee)-ΠempId (employee⋈(empId = eID)∧(empAge ≤ depAge)dependent) The above query evaluates to the set of empIds of employees whose age is greater than that of
Consider the following three relations in a relational database. Employee(eId, Name), Brand(bId, bName), Own(eId, bId) Which of the following relational algebra expressions return the set of eIds who own all the brands? 
The operation which is not considered a basic operation of relational algebra is
The most commonly used operation in relational algebra for projecting a set of tuple from a relation is
Which of the following is a fundamental operation in relational algebra?
Which of the following is used to denote the selection operation in relational algebra?
The select operation’s function in relational algebra is identical to the _______ clause in SQL