SQL IN & BETWEEN: Range Filtering & Set Membership

Filtering data by discrete lists or continuous ranges is a daily necessity in database development. The IN operator allows testing whether a value matches any item in a discrete list, while the BETWEEN operator tests whether a value falls within an inclusive numerical, date, or text range.

1. The IN Operator (Set Membership)

Instead of chaining cumbersome OR conditions:

-- Clunky syntax using chained OR:
SELECT * FROM students
WHERE course = 'BCA' OR course = 'MCA' OR course = 'B.Tech';

-- Clean, professional syntax using IN:
SELECT student_id, first_name, course
FROM students
WHERE course IN ('BCA', 'MCA', 'B.Tech');

You can also use NOT IN to exclude an entire set:

-- Exclude specific student IDs
SELECT student_id, first_name
FROM students
WHERE student_id NOT IN (101, 104, 109);

2. The BETWEEN Operator (Continuous Ranges)

The BETWEEN operator filters values within an inclusive range (including both boundary endpoints):

-- Numeric Range: Find students with GPA between 3.50 and 3.90
SELECT student_id, first_name, gpa
FROM students
WHERE gpa BETWEEN 3.50 AND 3.90;

-- Date Range: Find enrollments during the first quarter of 2026
SELECT student_id, first_name, enrollment_date
FROM students
WHERE enrollment_date BETWEEN '2026-01-01' AND '2026-03-31';

Next, let us master the subtle nuances of SQL NULL Handling & Three-Valued Logic!