MCQ IN COMPUTER SCIENCE & ENGINEERING

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COMPUTER SCIENCE AND ENGINEERING

SQL

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The ____ operation performs a set union of two “Similary Structured” tables
A
Intersect
B
Product
C
Union
D
Join
Explanation: 

Detailed explanation-1: -Explanation: The union operation performs the set union of 2 ‘Similarly Structured’ tables.

Detailed explanation-2: -The union operator requires that both relations are union-compatible. This means that they are required to have the same set of attributes.

Detailed explanation-3: -Relational algebra is a procedural query language, which takes instances of relations as input and yields instances of relations as output. It uses operators to perform queries.

Detailed explanation-4: -A relational database is a collection of information that organizes data in predefined relationships where data is stored in one or more tables (or “relations") of columns and rows, making it easy to see and understand how different data structures relate to each other.

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