The int data type in the MySQL database does not actually define its length in terms of the number of bytes, but is determined by its numerical range. The maximum length of the int type can accommodate integers from -2,147,483,648 to 2,147,483,647. This range is entirely determined by the 32-bit (4 bytes) storage space. Under MySQL's default settings, if the specific length of the int type is not specified when creating the table, the system will generate a field with a length of 11 by default. Although among these 11 bits, the first one is used to represent the positive and negative symbols, and the remaining The 10 digits are the actual number part.

It should be noted that even if you specify a specific length, MySQL will still reserve 11 bits for the int type, which is determined by its inherent data structure. This means that no matter what length you specify, int type data will always occupy 4 bytes when stored, but the empty bits will be filled with 0s.

MySQL database provides a variety of data types, including integer types (BIT, BOOL, TINYINT, SMALLINT, MEDIUMINT, INT, BIGINT), floating point types (FLOAT, DOUBLE, DECIMAL), string types ( CHAR, VARCHAR, TEXT, etc.), date and time types, and some special data types such as BINARY, ENUM, SET, etc. Each data type has its specific purpose and storage method. Understanding these details can help you better design and manage your database. For more detailed information, please refer to the MySQL data type section in Baidu Encyclopedia.