SQL>desc all_tab_columns
 Name                            Null?    Type
 ------------------------------- -------- ----
 OWNER                           NOT NULL VARCHAR2(30)
 TABLE_NAME                      NOT NULL VARCHAR2(30)
 COLUMN_NAME                     NOT NULL VARCHAR2(30)
 DATA_TYPE                                VARCHAR2(9)
 DATA_LENGTH                     NOT NULL NUMBER
 DATA_PRECISION                           NUMBER
 DATA_SCALE                               NUMBER
 NULLABLE                                 VARCHAR2(1)
 COLUMN_ID                       NOT NULL NUMBER
 DEFAULT_LENGTH                           NUMBER
 DATA_DEFAULT                             LONG
 NUM_DISTINCT                             NUMBER
 LOW_VALUE                                RAW(32)
 HIGH_VALUE                               RAW(32)
 DENSITY                                  NUMBER
 NUM_NULLS                                NUMBER
 NUM_BUCKETS                              NUMBER
 LAST_ANALYZED                            DATE
 SAMPLE_SIZE                              NUMBER