DBA_TAB_COLUMNS

Columns
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   TABLE_NAME
      Table, view or cluster name
   AVG_COL_LEN
      The average length of the column in bytes
   GLOBAL_STATS
      Are the statistics calculated without merging underlying partitions?
   CHAR_COL_DECL_LENGTH
      Declaration length of character type column
   CHARACTER_SET_NAME
      Character set name
   COLUMN_NAME
      Column name
   LAST_ANALYZED
      The date of the most recent time this column was analyzed
   OWNER
   NUM_BUCKETS
      The number of buckets in histogram for the column
   NUM_NULLS
      The number of nulls in the column
   DENSITY
      The density of the column
   HIGH_VALUE
      The high value in the column
   LOW_VALUE
      The low value in the column
   NUM_DISTINCT
      The number of distinct values in the column
   SAMPLE_SIZE
      The sample size used in analyzing this column
   DEFAULT_LENGTH
      Length of default value for the column
   USER_STATS
      Were the statistics entered directly by the user?
   DATA_DEFAULT
      Default value for the column
   DATA_TYPE
      Datatype of the column
   COLUMN_ID
      Sequence number of the column as created
   NULLABLE
      Does column allow NULL values?
   DATA_SCALE
      Digits to right of decimal point in a number
   DATA_LENGTH
      Length of the column in bytes
   DATA_TYPE_OWNER
      Owner of the datatype of the column
   DATA_PRECISION
      Length: decimal digits (NUMBER) or binary digits (FLOAT)
   DATA_TYPE_MOD
      Datatype modifier of the column

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