in Databases
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Consider the relations:

$R_{1}${Roll_No, Name, Grades} and 

$R_{2}${Roll_No, Subject_ID, Grades}

Which of the following operations cannot be performed using the above relations? 

 

  1. Union 
  2. Select 
  3. Join
  4. Project
in Databases
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1 Answer

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2 votes

Answer: A

R1 and R2 is not union compatible.

SQL UNION Operator (w3schools.com)

Set operations (SQL) - Wikipedia