https://dev.mysql.com/doc/refman/5.7/en/storage-requirements.html
+----------------------------+----------------------------------------------------+--------------------------------+ | Data Type | Storage Required | Java Type | +----------------------------+----------------------------------------------------+--------------------------------+ | TINYINT | 1 byte | Byte | | SMALLINT | 2 bytes | Short | | MEDIUMINT | 3 bytes | Integer | | INT, INTEGER | 4 bytes | Integer | | BIGINT | 8 bytes | Long | | FLOAT(0-24) | 4 bytes if 0 <= p <= 24 | Float | | FLOAT(25-53) | 8 bytes if 25 <= p <= 53 | Double | | FLOAT | 4 bytes | Float | | DOUBLE(0-8) | 8 bytes | Double | | REAL | 8 bytes | Double | | DECIMAL(m,n) | Maximum is 65 for 'm',Maximum is 30 for 'n'. | | | DECIMAL(1-4,0) | | Short | | DECIMAL(5-9,0) | | Integer | | DECIMAL(0,0) | Same as decimal | Long | | DECIMAL(10-18,0) | | Long | | DECIMAL(19-65,0) | | BigDecimal | | DECIMAL(m,1+) | | BigDecimal | | NUMERIC(m,n) | Same as DECIMAL(m,n) | | | BIT(n) | approximately (M+7)/8 bytes | Boolean | +----------------------------+----------------------------------------------------+--------------------------------+