Comparison Operators

Source data — Pattern 2: Filtering Data

All queries run against the shared employees table (see schema.sql). This pattern also needs the manager_id column for topic 14 — not required back in Pattern 1. It also needs one row with salary < 50000 for topic 9, which Pattern 1's 6 rows didn't have — add:

INSERT INTO employees (employee_id, first_name, last_name, salary, department_id,
manager_id)
VALUES (7, 'Zoya', 'Khan', 42000, 500, 1);

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What it does

WHERE conditions are built from comparison operators: =, != / <>, <, >, <=, >=. These compare a column to a value (or another column) and return true/false per row.

Problem

Find employees whose salary is less than ₹50,000.

SELECT *
FROM employees
WHERE salary < 50000;

Result