What are the database float lengths?

Common database float lengths are: 1. The float type length in MySQL can be 4 bytes or 8 bytes; 2. The float type length in Oracle can be 4 bytes or 8 bytes; 3. The float type length in SQL Server is fixed at 8 bytes; 4. The float type length in PostgreSQL can be 4 bytes or 8 bytes, etc.

The operating system of this tutorial: Windows 10 system, Dell G3 computer.

The float type in the database is a data type used to store floating point numbers. In different database management systems, the length of the float type can vary. The following will introduce the length of some common float types in databases.

1. The length of the float type in MySQL:

In MySQL, the length of the float type can be 4 bytes or 8 bytes. When the length is 4 bytes, floating point numbers in the range -3.402823466E 38 to -1.175494351E-38, 0, or 1.175494351E-38 to 3.402823466E 38 can be stored. When the length is 8 bytes, floating point numbers in the range -1.7976931348623157E 308 to -2.2250738585072014E-308, 0, or 2.2250738585072014E-308 to 1.7976931348623157E 308 can be stored.

2. The length of the float type in Oracle:

In Oracle, the length of the float type can be 4 bytes or 8 bytes. When the length is 4 bytes, floating point numbers in the range -3.402823466E 38 to -1.175494351E-38, 0, or 1.175494351E-38 to 3.402823466E 38 can be stored. When the length is 8 bytes, floating point numbers in the range -1.7976931348623157E 308 to -2.2250738585072014E-308, 0, or 2.2250738585072014E-308 to 1.7976931348623157E 308 can be stored.

3. The length of the float type in SQL Server:

In SQL Server, the length of the float type is fixed at 8 bytes. Can store floating point numbers in the range -1.79E 308 to -2.23E-308, 0, or 2.23E-308 to 1.79E 308.

4. The length of the float type in PostgreSQL:

In PostgreSQL, the length of the float type can be 4 bytes or 8 bytes. When the length is 4 bytes, floating point numbers in the range -3.402823466E 38 to -1.175494351E-38, 0, or 1.175494351E-38 to 3.402823466E 38 can be stored. When the length is 8 bytes, floating point numbers in the range -1.7976931348623157E 308 to -2.2250738585072014E-308, 0, or 2.2250738585072014E-308 to 1.7976931348623157E 308 can be stored.

Summary:

The length of the float type in different database management systems may vary, but it is usually 4 bytes or 8 bytes. When choosing the float type, you need to determine the appropriate length based on specific needs and database system requirements.

The above is the detailed content of What are the database float lengths?. For more information, please follow other related articles on the PHP Chinese website!