ADM_TAB_COLUMNS

ADM_TAB_COLUMNS displays information about the columns of tables. Each column of each table in the database has a row of data in ADM_TAB_COLUMNS. By default, only the SYSADMIN can access this view. Common users can access the view only after being authorized. This view exists in both PG_CATALOG and SYS schemas.

**Table 1** ADM_TAB_COLUMNS columns
Name	Type	Description
owner	character varying(64)	Table owner.
table_name	character varying(64)	Table name.
column_name	character varying(64)	Column name.
data_type	character varying(128)	Data type of the column.
data_length	integer	Length of a column, in bytes.
data_precision	integer	Precision of a data type. This column is valid for the numeric data type and NULL for other data types.
data_scale	integer	Number of decimal places. This column is valid for the numeric data type and 0 for other data types.
nullable	bpchar	Specifies whether a column can be empty (n for the primary key constraint and NOT NULL constraint).
column_id	integer	Sequence number of a column when a table is created.
avg_col_len	numeric	Average length of a column, in bytes.
char_length	numeric	Column length (in characters) which is valid only for the varchar, nvarchar2, bpchar, and char types.
comments	text	Comments.