What is the difference between decimal and numeric in SQL Server?

In SQL Server, decimal and numeric are functionally equivalent and can be used interchangeably.

Can float data type cause rounding errors?

Yes, float stores approximate values and can introduce rounding errors, so it is not recommended for exact calculations.

What is the storage size of an int in SQL Server?

An int in SQL Server uses 4 bytes of storage.

Why specify precision and scale for decimal types?

Specifying precision and scale controls the total number of digits and decimal places, ensuring data fits expected formats.

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SQL Server Numeric Data Types - Complete Beginner Tutorial | RPATechnology.in

Topic 2924 min readStructured Tutorial

SQL Server Numeric Data Types

Quick Answer

SQL Server numeric data types store numbers with or without decimals. They include int, bigint, smallint, tinyint for integers, decimal and numeric for fixed precision decimals, and float and real for approximate floating-point numbers. Choosing the right type ensures efficient storage and accurate calculations.

Learning Objectives

Identify the main numeric data types in SQL Server and their uses.
Understand the differences between integer, decimal, and floating-point types.
Learn how to choose appropriate numeric data types for database design.

Introduction

Numeric data types are fundamental in SQL Server for storing numbers used in calculations, identifiers, and measurements.

Understanding the differences between numeric types helps you design efficient and accurate databases.

Choosing the right numeric data type is key to balancing precision and performance.

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Author

RPATechnology Team

Last Updated

June 2026

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Floating-Point Data Types

Float and real types store approximate floating-point numbers using IEEE standards. They are suitable for scientific calculations but can introduce rounding errors.

Use float for larger precision and real for smaller precision floating-point numbers.

real: 4 bytes, approximate range -3.40E+38 to 3.40E+38
float(n): variable storage, where n is the number of bits used to store the mantissa (precision).

Float Storage Size Based on Precision
Precision (n)	Storage Size (bytes)
1 to 24	4 (real)
25 to 53	8 (float)

Examples

Defining Columns with Numeric Data Types

CREATE TABLE Sales (
  SaleID int PRIMARY KEY,
  Quantity smallint,
  Price decimal(10, 2),
  Discount float
);

This example creates a table with integer, decimal, and float columns to store sales data with appropriate numeric types.

Learning Objectives

Introduction

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Choosing the Right Numeric Data Type

Practical Example

Examples

Best Practices

Common Mistakes

Hands-on Exercise

Choosing Numeric Data Types

Interview Questions

What is the difference between int and bigint in SQL Server?

When should you use decimal instead of float?

What does the scale parameter specify in decimal(p, s)?

MCQ Quiz

1. Which SQL Server numeric data type should you use to store whole numbers ranging from 0 to 255 efficiently?

2. What is the main difference between decimal (or numeric) and float data types in SQL Server?

3. If you need to store a monetary value with two decimal places and a total of 10 digits, which SQL Server data type declaration is appropriate?

4. Why is it recommended to choose the smallest integer type that fits your data in SQL Server?

5. Which numeric data type in SQL Server is most suitable for scientific calculations where approximate values are acceptable?

Key Takeaways

Frequently Asked Questions

What is the difference between decimal and numeric in SQL Server?

Can float data type cause rounding errors?

What is the storage size of an int in SQL Server?

Why specify precision and scale for decimal types?

Summary

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