Beginner

35. SQL Boolean Values

Understand Boolean or logical values that represent true and false conditions in SQL.

📘 Lesson 35 of 728 ⏱ 7 min 🎯 Beginner

A Boolean value represents a logical state such as TRUE or FALSE. Database systems differ in how Boolean values are stored and supported. Some systems provide a dedicated BOOLEAN or BIT data type, while others may represent logical states using numeric or character values.

Many business datasets contain yes/no or active/inactive information. Understanding Boolean concepts helps analysts work with status fields and logical conditions correctly.

An employee table may contain an IsActive field that indicates whether an employee is currently active. The value can represent a true or false state depending on the database system.

SQL 
SELECT
    EmployeeName,
    IsActive
FROM Employees
WHERE IsActive = TRUE;

Boolean-style fields are common in employee records, customer accounts, product status, transaction status, system settings, and application databases.

  • Boolean values represent logical states.
  • TRUE and FALSE are common Boolean concepts.
  • Database support for Boolean types varies.
  • Boolean fields are useful for status information.
  • Logical conditions are widely used in SQL filtering.
What is a Boolean value?

A Boolean value represents a logical state such as TRUE or FALSE.

Do all databases store Boolean values in exactly the same way?

No. Database systems can use different data types or representations for Boolean information.

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