Decimal usage in oracle

The Oracle DECIMAL data type provides high-precision decimal value storage for calculations that require precise calculations. Features include: Configurable precision, variable length between 1 and 38, depending on precision and range High precision, accurate calculation of currency, scientific data, etc. Immutable, value cannot be changed after creation

DECIMAL data type in Oracle

The DECIMAL data type is used to store high-precision decimal values ​​when precise calculations of monetary, financial or scientific data are required. very useful.

Features

• Precision and range: DECIMAL has a configurable precision between 1 and 38, representing a number Number of decimal places. The range is from -10^38-1 to 10^38-1.
• Variable length: The length of DECIMAL depends on precision and range, not a predefined size.
• High precision: DECIMAL has much higher precision than other numeric data types and can be used for precise calculations.
• Immutable: DECIMAL value cannot be changed after creation.

Syntax

Create DECIMAL column:

<code class="sql">CREATE TABLE my_table (
  decimal_column DECIMAL(precision, scale)
);</code>

Where:

• precision is the sum of the number of decimal places and integer places (maximum 38).
• scale is the number of decimal places (maximum precision).

Example

Store a currency value with two decimal places:

<code class="sql">CREATE TABLE orders (
  price DECIMAL(8, 2)
);</code>

Store a timestamp accurate to milliseconds:

<code class="sql">CREATE TABLE events (
  timestamp DECIMAL(20, 6)
);</code>

Advantages

• High precision, suitable for precise calculations.
• Variable length, optimize storage space.
• Can be used in financial, scientific and monetary applications.

Disadvantages

• The storage and operation costs are higher than other numeric data types.
• Explicit conversion may be required in some cases.

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