How to use decimal in mysql

The DECIMAL data type in MySQL is used to represent precise decimal and monetary values. Its features include: accurately storing decimals and not affected by rounding errors of floating point data. The range depends on the precision value, for example DECIMAL(10, 2) ranges from -9999999999.99 to 9999999999.99. More efficient than floating point data types because fewer bits are stored.

Usage of DECIMAL data type in MySQL

The DECIMAL data type is used to represent precise decimal and monetary values. It is more suitable than floating point data types in most cases.

Syntax

DECIMAL(precision, scale)

• precision: Specifies the total number of digits, including the number of digits after the decimal point.
• scale: Specify the number of digits after the decimal point.

Example

CREATE TABLE sales (
  price DECIMAL(10, 2)
);

This will create a table named sales where the price field is a DECIMAL data type, the total number of digits is 10, and there are 2 digits after the decimal point.

Features

• ##Accuracy: The DECIMAL data type can accurately store decimals and is not affected by rounding errors of floating point data.
• Range: The range of the DECIMAL data type depends on the precision value. For example, DECIMAL(10, 2) ranges from -9999999999.99 to 9999999999.99.
• Storage efficiency: The DECIMAL data type is more efficient than the floating-point data type because fewer bits are stored.

Best Practices

Only when precision is required Use DECIMAL when calculating.
• Choose appropriate
• precision and scale to avoid unnecessary waste of storage space.
For monetary values, use an integer or a DECIMAL with a definite decimal point position, such as
• DECIMAL(10, 2).
Avoid mixing DECIMAL values ​​with floating point values ​​as this may cause rounding errors.

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