How to retrieve view column type?

I know how to retrieve column names and comments from
table all_col_comments.But I don't know retrieving view column type.If somebody know please help.

ALL_TAB_COLUMNS
ALL_TAB_COLUMNS describes the columns of the tables, views, and clusters accessible to the current user. To gather statistics for this view, use the SQL ANALYZE statement or the DBMS_STATS package.
Related Views
DBA_TAB_COLUMNS describes the columns of all tables, views, and clusters in the database.
USER_TAB_COLUMNS describes the columns of the tables, views, and clusters owned by the current user. This view does not display the OWNER column.
Column Datatype NULL Description
OWNER
VARCHAR2(30)
NOT NULL
Owner of the table, view, or cluster
TABLE_NAME
VARCHAR2(30)
NOT NULL
Name of the table, view, or cluster
COLUMN_NAME
VARCHAR2(30)
NOT NULL
Column name
DATA_TYPE
VARCHAR2(30)
Datatype of the column
DATA_TYPE_MOD
VARCHAR2(3)
Datatype modifier of the column
DATA_TYPE_OWNER
VARCHAR2(30)
Owner of the datatype of the column
DATA_LENGTH
NUMBER
NOT NULL
Length of the column in bytes
DATA_PRECISION
NUMBER
Decimal precision for NUMBER datatype; binary precision for FLOAT datatype, null for all other datatypes
DATA_SCALE
NUMBER
Digits to right of decimal point in a number
NULLABLE
VARCHAR2(1)
Specifies whether a column allows NULLs. Value is N if there is a NOT NULL constraint on the column or if the column is part of a PRIMARY KEY.
COLUMN_ID
NUMBER
NOT NULL
Sequence number of the column as created
DEFAULT_LENGTH
NUMBER
Length of default value for the column
DATA_DEFAULT
LONG
Default value for the column
NUM_DISTINCT
NUMBER
These columns remain for backward compatibility with Oracle7. This information is now in the TAB_COL_STATISTICS views. This view now picks up these values from HIST_HEAD$ rather than COL$.
LOW_VALUE
RAW(32)
HIGH_VALUE
RAW(32)
DENSITY
NUMBER
NUM_NULLS
NUMBER
Number of nulls in the column
NUM_BUCKETS
NUMBER
The number of buckets in histogram for the column
Note: The number of buckets in a histogram is specified in the SIZE parameter of the SQL statement ANALYZE. However, Oracle does not create a histogram with more buckets than the number of rows in the sample. Also, if the sample contains any values that are very repetitious, Oracle creates the specified number of buckets, but the value indicated by this column may be smaller because of an internal compression algorithm.
LAST_ANALYZED
DATE
The date on which this column was most recently analyzed
SAMPLE_SIZE
The sample size used in analyzing this column
CHARACTER_SET_NAME
VARCHAR2(44)
The name of the character set: CHAR_CS or NCHAR_CS
CHAR_COL_DECL_LENGTH
NUMBER
The length
GLOBAL_STATS
VARCHAR2(3)
For partitioned tables, indicates whether column statistics were collected for the table as a whole (YES) or were estimated from statistics on underlying partitions and subpartitions (NO).
USER_STATS
VARCHAR2(3)
Were the statistics entered directly by the user?
AVG_COL_LEN
NUMBER
Average length of the column (in bytes)
CHAR_LENGTH
NUMBER
Displays the length of the column in characters. This value only applies to the following datatypes:
CHAR
VARCHAR2
NCHAR
NVARCHAR
CHAR_USED
VARCHAR2(1)
B | C. B indicates that the column uses BYTE length semantics. C indicates that the column uses CHAR length semantics. NULL indicates the datatype is not any of the following:
CHAR
VARCHAR2
NCHAR
NVARCHAR2
http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96536/ch2143.htm#1302694
Joel P�rez

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