Explanation/Reference:
Explanation:
■ LONG Character data in the database character set, up to 2GB. All the functionality of LONG (and more) is provided by CLOB; LONGs should not be used in a modern database, and if your database has any columns of this type they should be converted to CLOB. There can only be one LONG column in a table.
DVARCHAR2 Variable-length character data, from 1 byte to 4KB. The data is stored in the database character set. The VARCHAR2 data type must be qualified with a number indicating the maximum length of the column.
If a value is inserted into the column that is less than this, it is not a problem: the value will only take up as much space as it needs. If the value is longer than this maximum, the INSERT will fail with an error.
VARCHAR2(size)
Variable-length character data (A maximum size must be specified: minimum size is 1; maximum size is 4,
000.)
BLOB Like CLOB, but binary data that will not undergo character set conversion by Oracle Net.
BFILE A locator pointing to a file stored on the operating system of the database server. The size of the files is limited to 4GB.
TIMESTAMP This is length zero if the column is empty, or up to 11 bytes, depending on the precision specified.
Similar to DATE, but with precision of up to 9 decimal places for the seconds, 6 places by default.