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Which of the following Relational Algebra operations can be used when you want to keep all the tuples of the first relation irrespective of whether or not they have matching tuples in the second relation?

Which of the following Relational Algebra operations can be used when you want to keep all the tuples of the first relation irrespective of whether or not they have matching tuples in the second relation? Correct Answer Left-outer join

The answer to the above question is Option 2) Left-outer Join
A JOIN clause is used to combine rows from two or more tables, based on a related column between them.

Here are the different types of the JOINs in SQL:

  1. (INNER) JOIN: Returns records that have matching values in both tables
  2. LEFT (OUTER) JOIN: Returns all records from the left table, and the matched records from the right table
  3. RIGHT (OUTER) JOIN: Returns all records from the right table, and the matched records from the left table
  4. FULL (OUTER) JOIN: Returns all records when there is a match in either left or right table

We can see that left join keeps all the elements from the first relation irrespective of their presence in second relation.

Diagram to visualize joins:
[ alt="F1 Harshita11-2-22 Savita D16" joins dev community src="//storage.googleapis.com/tb-img/production/22/02/F1__Harshita11-2-22_Savita_D16.png" style="height: 194px; width: 221px;">

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