Question 1318 – Relational-Algebra
May 3, 2024Question 4540 – 2011 December UGC NET Paper 1
May 3, 2024Question 6745 – Relational-Algebra
Semi-join strategies are techniques for query processing in distributed database system. Which of the following is a semi-join technique ?
Correct Answer: C
Question 61 Explanation:
A semi-join returns one copy of each row in the first table for which at least one match is found. Semi-join is like EXCEPT command in SQL.
Only the joining attributes are sent from one site to another and then all of the rows are returned.
All of the attributes are sent from one site to another and then only the required rows are returned.
Only the joining attributes are sent from one site to another and then only the required rows are returned.
All of the attributes are sent from one site to another and then only the required rows are returned.
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