Question

SQL'S JOIN Operator (INNER JOIN) inside a FROM clause (ON/ USING)

Option 1: INNER JOIN
Option 2: LEFT OUTER JOIN
Option 3: RIGHT OUTER JOIN
Option 4: FULL OUTER JOIN

Answer 1

SQL's JOIN operator includes INNER JOIN, LEFT OUTER JOIN, RIGHT OUTER JOIN, and FULL OUTER JOIN.

In SQL, the JOIN operator is used to combine rows from different tables based on a related column between them. There are four types of JOIN operators:

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

For example, consider two tables: Students and Courses. An INNER JOIN between the two tables will return the matching records where a student is enrolled in a course.