All matter is made of atoms. Atoms are the smallest particle of matter. They are so small that you cannot see them with your eyes or even with a standard microscope. A standard sheet of paper is about a million atoms thick.
Answer Wiki. The int type is a 4-byte signed integer. There are also tinyint (1 byte), smallint (2 bytes), and bigint (8 bytes), and unsigned versions of all of these. As Apostolos mentioned, the docs for all the numeric types are here: http://dev.mysql.com/doc/refman/...
(The only exception is arrays, where byte is guaranteed to use only one byte per array element, short will use two bytes, and int will use four.). long. long is a signed 64-bit type and is useful for those occasions where an int type is not large enough to hold the desired value.