Correct option is B
The
IN command in SQL is used to filter rows based on whether a column's value matches any value in a
specified list. It simplifies multiple OR conditions and is particularly useful when the list of values is predefined or dynamically generated.
Example Query:
SELECT * FROM employees
WHERE department_id IN (101, 102, 103);
This query retrieves all employees whose department_id is either 101, 102, or 103.
Important Key Points:
1.
Efficient Filtering: The IN command is efficient for comparing a column against multiple values.
2.
Simplifies Conditions: It replaces complex OR conditions, making queries more readable.
3.
Dynamic Lists: The list in the IN clause can be static or the result of a subquery.
Knowledge Booster:
·
BETWEEN: Used to filter rows based on a range of values (e.g., BETWEEN 10 AND 20).
·
LIKE: Filters rows based on pattern matching (e.g., LIKE 'A%' for strings starting with "A").
·
EXISTS: Checks for the existence of rows returned by a subquery.
·
DISTINCT: Ensures unique results by removing duplicates, not used for filtering by list values.