✏️ Explanatory Question

What is the difference between the IN and BETWEEN operators?

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Answer with Explanation

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What is the difference between the IN and BETWEEN operators?

Level: Basic to Intermediate — Both filter multiple values, but they work in very different ways.

Both operators simplify WHERE conditions that would otherwise need multiple OR clauses, but they target different scenarios:

  • IN: Checks whether a value matches any value in a specific list (discrete values). It is a shorthand for multiple OR conditions.
  • BETWEEN: Checks whether a value falls within a continuous range (inclusive of both endpoints).
Key point: BETWEEN is inclusiveBETWEEN 10 AND 20 includes both 10 and 20. Use IN for a fixed set of specific values and BETWEEN for a range.

Side-by-Side Comparison

Feature IN BETWEEN
Matches A list of discrete values A continuous range
Boundaries N/A Inclusive (both ends)
Equivalent to Multiple OR conditions >= AND <=
Works with subquery? Yes (IN + subquery) No
Best for Specific IDs, categories Dates, numeric ranges

Quick Example

-- IN: match a fixed list of values
SELECT * FROM employees
WHERE dept_id IN (10, 20, 30);

-- Equivalent using OR (longer)
SELECT * FROM employees
WHERE dept_id = 10 OR dept_id = 20 OR dept_id = 30;

-- BETWEEN: match a continuous range (inclusive)
SELECT * FROM employees
WHERE salary BETWEEN 30000 AND 60000;

-- Equivalent using comparison operators
SELECT * FROM employees
WHERE salary >= 30000 AND salary <= 60000;

-- BETWEEN with dates
SELECT * FROM orders
WHERE order_date BETWEEN '2026-01-01' AND '2026-03-31';

-- IN with a subquery (BETWEEN cannot do this)
SELECT * FROM employees
WHERE dept_id IN (SELECT dept_id FROM departments WHERE location = 'Kolkata');
Interviewer tip: The one-liner they want — "IN matches a value against a discrete list (like multiple ORs), while BETWEEN matches a value within an inclusive continuous range. IN can also take a subquery; BETWEEN cannot."