In SQL, the **INT data type** is used to store whole numbers. It stands for “integer” and is one of the most commonly used data types in database systems. An integer is a number that does not have any decimal places and can be either positive or negative.

## Features of INT Data Type:

**Size:** The size of the INT data type may vary depending on the database system being used. In most cases, it occupies 4 bytes of storage space.
**Range:** The range of values that can be stored in an INT varies based on the signedness (whether it allows negative values or not).
For a signed INT, the range typically spans from -2,147,483,648 to 2,147,483,647. If unsigned, the range is usually from 0 to 4,294,967,295.

**Storage Efficiency:** Compared to other numeric data types like FLOAT or DECIMAL, INT requires less storage space and is generally more efficient in terms of memory usage.

## Usage Examples:

The INT data type can be used in various scenarios where whole numbers need to be stored. Here are a few examples:

### 1. Storing IDs:

In many database systems, IDs are often represented as integers. Whether it’s a user ID in a user table or a product ID in an inventory table, using the INT data type ensures efficient storage and easy manipulation of these identifiers.

### 2. Counting and Indexing:

The INT data type is commonly used for counting purposes or creating indexes on numeric columns.

For instance, you might have a table that keeps track of the number of downloads for each file. Storing this count as an INT allows for efficient aggregation and querying operations.

### 3. Mathematical Calculations:

Since INT is a numeric data type, it can be used in mathematical calculations within SQL queries. You can perform arithmetic operations like addition, subtraction, multiplication, and division on integer columns or variables.

Overall, the INT data type is a fundamental component of SQL databases. Its simplicity, efficiency, and versatility make it suitable for a wide range of applications where whole numbers need to be stored and manipulated.

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