What Is Double Data Type in Access?


Angela Bailey

What Is Double Data Type in Access?

When working with databases, it is important to understand the different data types that can be used to store and manipulate data. One such data type is the Double data type in Microsoft Access.

The Double data type is a numeric data type that can store decimal numbers with a high degree of precision. It is particularly useful when working with numbers that require a large range of values or when precise calculations are necessary.

Defining Double Data Type

In Access, the Double data type is represented by an 8-byte floating-point number. This means that it can store both positive and negative numbers, as well as decimal fractions.

To define a field or variable as a Double, you can use the following syntax:

fieldName Double

Benefits of Using Double Data Type

The Double data type offers several benefits:

  • Precision: The Double data type allows for highly precise calculations due to its ability to store decimal fractions.
  • Range: Unlike some other numeric data types, such as Integer or Long Integer, the Double data type has a much larger range of values it can store. It can handle very small and very large numbers.
  • Versatility: The Double data type can be used to store different types of numerical values, including whole numbers, decimals, and scientific notation.
  • Multifunctional: The Double data type can be used for various calculations, including mathematical operations, statistical analysis, and financial calculations.

Usage Considerations

While the Double data type offers numerous benefits, there are a few considerations to keep in mind:

  • Storage size: The Double data type requires more storage space compared to other numeric data types. This should be taken into account when designing database tables or working with large datasets.
  • Rounding errors: Due to the way floating-point numbers are represented in computer systems, there is a possibility of small rounding errors when performing calculations with the Double data type. This may not be significant in most cases but should be considered for critical applications requiring absolute precision.

Examples of Double Data Type Usage

The Double data type can be used in various scenarios:

Example 1: Financial Calculations

In a financial application, the Double data type can be used to store values such as currency amounts, interest rates, or investment returns.

Dim totalAmount As Double
totalAmount = principalAmount + (principalAmount * interestRate)

Example 2: Scientific Calculations

In scientific applications, the Double data type is commonly used to store measurements or perform complex calculations.

Dim distance As Double
distance = speed * time


In addition to the Double data type, Access also provides other numeric data types such as Integer, Long Integer, Single, and Decimal. The choice of data type depends on the specific requirements of your application.

In conclusion, the Double data type in Access is a versatile and powerful option for storing and manipulating decimal numbers with precision. By understanding its features and limitations, you can make informed decisions when designing your database tables or writing code.

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