What is the difference between BETWEEN and IN?

BETWEEN and IN are SQL operators used for filtering data in WHERE conditions, but they work differently.

In simple words:

• BETWEEN checks values within a range
• IN checks values from a specific list

Why BETWEEN and IN are Important

Enterprise applications frequently require:

• Data filtering
• Search operations
• Range queries
• Analytics reporting
• Business rule filtering

BETWEEN and IN help:

• Retrieve specific datasets efficiently
• Simplify query conditions
• Improve query readability

Main Difference Between BETWEEN and IN

What is BETWEEN in SQL?

BETWEEN is used to:

Filter values within a specified range.

BETWEEN Syntax

SELECT column_name

FROM table_name

WHERE column_name BETWEEN value1 AND value2;

Employees Table Example

BETWEEN Example

SELECT employee_name,
       salary

FROM employees

WHERE salary BETWEEN 50000 AND 80000;

Result

How BETWEEN Works Internally

BETWEEN internally behaves like:

salary >= 50000
AND
salary <= 80000

Important Point

BETWEEN includes:

• Boundary values

Meaning

50000 and 80000 are:

• Included in the result

BETWEEN Internal Architecture

Read Value
    |
    v
Check Lower Limit
    |
    v
Check Upper Limit
    |
    v
Within Range?
 /           \
Yes           No
 |             |
Return Row   Ignore Row

BETWEEN with Dates

BETWEEN is commonly used with:

• Date ranges

Example

SELECT *

FROM orders

WHERE order_date BETWEEN
      '2026-01-01'
AND
      '2026-01-31';

Purpose

Retrieve January orders.

BETWEEN with Text

BETWEEN can also work with:

• String values

Example

SELECT *

FROM students

WHERE student_name BETWEEN
      'A'
AND
      'M';

What is IN in SQL?

IN is used to:

Check whether a value matches any value in a specified list.

IN Syntax

SELECT column_name

FROM table_name

WHERE column_name IN (
    value1,
    value2,
    value3
);

IN Example

SELECT employee_name,
       department

FROM employees

WHERE department IN (
    'IT',
    'HR'
);

Result

Employees belonging to:

• IT department
• HR department

How IN Works Internally

IN internally behaves like:

department = 'IT'
OR
department = 'HR'

IN Internal Architecture

Read Value
    |
    v
Compare with List Values
    |
    v
Match Found?
 /           \
Yes           No
 |             |
Return Row   Ignore Row

IN with Numbers

SELECT *

FROM employees

WHERE employee_id IN (
    1,
    5,
    10
);

Purpose

Retrieve employees:

• With selected IDs

IN with Subquery

IN is commonly used with:

• Subqueries

Example

SELECT employee_name

FROM employees

WHERE department_id IN (

    SELECT department_id
    FROM departments
    WHERE location = 'Hyderabad'

);

Purpose

Retrieve employees:

• Working in Hyderabad departments

Visual Comparison

BETWEEN

Range Check

50000 → 80000

IN

Specific Value Check

IT, HR, Finance

BETWEEN vs IN Logic

NOT BETWEEN

Used to:

• Exclude ranges

Example

SELECT *

FROM employees

WHERE salary NOT BETWEEN
      50000
AND
      80000;

Purpose

Retrieve employees:

• Outside salary range

NOT IN

Used to:

• Exclude specific values

Example

SELECT *

FROM employees

WHERE department NOT IN (
    'IT',
    'HR'
);

Purpose

Retrieve employees:

• Not belonging to IT or HR

Performance Consideration

BETWEEN

• Efficient for indexed range queries

IN

• Efficient for small value lists

Large IN Lists May:

• Reduce query performance

BETWEEN and Index Optimization

BETWEEN works efficiently with:

• Range indexes

IN and Query Optimization

Databases may internally optimize:

• Small IN lists efficiently

BETWEEN vs IN Query Flow

BETWEEN:
Check Range Boundaries

IN:
Check List Membership

Real-Time Banking Example

Banking systems use BETWEEN for:

• Date range reports
• Transaction amount filtering

Example

Find transactions between
10000 and 50000.

Banking Systems use IN for:

• Specific branch filtering
• Selected account types

Example

WHERE account_type IN (
    'Savings',
    'Current'
)

Real-Time E-Commerce Example

E-commerce platforms use BETWEEN for:

• Price filtering
• Order date ranges

Example

WHERE price BETWEEN
500 AND 5000

E-Commerce Platforms use IN for:

• Category filtering
• Brand selection

Example

WHERE category IN (
    'Mobiles',
    'Laptops'
)

Real-Time Learning Platform Example

Learning platforms use BETWEEN for:

• Score range analysis
• Date filtering

Example

WHERE marks BETWEEN
70 AND 100

Learning Platforms use IN for:

• Course category filtering
• Department selection

BETWEEN and IN in Microservices

Microservices use:

• BETWEEN for analytical range APIs
• IN for multi-selection filters

Advantages of BETWEEN

• Simple range filtering
• Readable syntax
• Efficient for indexed ranges

Advantages of IN

• Easy multiple-value filtering
• Cleaner than multiple OR conditions

Disadvantages of BETWEEN

• Limited to continuous ranges

Disadvantages of IN

• Large lists may reduce performance

Best Practices

• Use BETWEEN for range conditions
• Use IN for discrete value filtering
• Optimize indexed columns
• Avoid very large IN lists

Common Interview Mistake

Many developers think:

• BETWEEN and IN are interchangeable

Reality

BETWEEN works for:

• Continuous ranges

while IN works for:

• Specific discrete values

Related Learning Topics

• What is WHERE Clause in SQL?
• Difference Between ANY and ALL
• What is a Subquery in SQL?
• What is ORDER BY in SQL?
• MySQL Performance Optimization

Professional Interview Answer

BETWEEN and IN are SQL operators used for filtering data in WHERE conditions, but they serve different purposes. BETWEEN is used for checking whether a value lies within a continuous range and internally behaves like an AND condition. IN is used for checking whether a value matches any value from a specified list and internally behaves like multiple OR conditions. BETWEEN is commonly used for date ranges, salary ranges, and numerical filtering, whereas IN is used for category filtering, status selection, and multi-value comparisons. These operators are widely used in enterprise applications such as banking systems, e-commerce platforms, analytics dashboards, and microservices-based APIs for efficient data filtering and reporting.

Why Interviewers Like This Answer

• Clearly explains range vs list filtering
• Includes internal logic understanding
• Shows optimization awareness
• Provides enterprise-level examples
• Explains BETWEEN vs IN execution behavior

Frequently Asked Questions

What is BETWEEN used for in SQL?

BETWEEN is used to filter values within a range.

What is IN used for in SQL?

IN is used to filter rows matching specific values from a list.

Does BETWEEN include boundary values?

Yes, BETWEEN includes both lower and upper boundary values.

Can IN be used with subqueries?

Yes, IN is commonly used with subqueries.

Which is better for range filtering?

BETWEEN is better for continuous range filtering.