How to express decimals in mysql

Decimal numbers in MySQL are represented as floating point numbers, including FLOAT and DOUBLE types. FLOAT has lower precision and narrower range, while DOUBLE has higher precision and wider range. FLOAT is suitable for numerical values ​​that do not require high precision, while DOUBLE is suitable for numerical values ​​that require high precision. Decimal representation is limited to floating point standards and rounding errors may occur. For calculations requiring high precision, it is recommended to use the DECIMAL type.

Representation of decimals in MySQL

In MySQL, decimals are represented by floating point number types, and there are two types:

• FLOAT: The precision is 24 bits and the storage range is -3.4028234663852886e 38 to -1.1754943508222875e-38 and 0 to 1.1754943508222875e 38.
• DOUBLE: 53-bit precision, wider storage range than FLOAT, -1.7976931348623157e 308 to -4.9406564584124654e-324 and 0 to 4.9406564584124654e 324.

Choose FLOAT or DOUBLE

FLOAT and DOUBLE are suitable for different scenarios:

• FLOAT:Usually used to store values ​​with a small range and low precision requirements, such as currency values ​​or temperatures.
• DOUBLE: Suitable for storing values ​​with a wide range and high precision requirements, such as scientific calculations or statistical data.

Examples of decimal representation

The following are some examples of decimal representation in FLOAT and DOUBLE:

• FLOAT: -123.456789
• DOUBLE: -1234567890123456789.123456789

Note

• Decimal representation in MySQL does not fully comply with the IEEE 754 floating point standard.
• Due to the limited precision of floating point numbers, rounding errors may occur in some operations.
• For decimal calculations that require high precision, it is recommended to use the DECIMAL type instead of the floating point number type.

The above is the detailed content of How to express decimals in mysql. For more information, please follow other related articles on the PHP Chinese website!