List all columns in specific table in Oracle database

Ania

28th November, 2018

Query below lists:

(A) all columns in a specific table accessible to the current user in Oracle database

(B) all columns in a specific table in Oracle database

Query was executed under the Oracle9i Database version.

Query

A. Table accessible to the current user

select col.column_id, 
       col.owner as schema_name,
       col.table_name, 
       col.column_name, 
       col.data_type, 
       col.data_length, 
       col.data_precision, 
       col.data_scale, 
       col.nullable
from sys.all_tab_columns col
inner join sys.all_tables t on col.owner = t.owner 
                              and col.table_name = t.table_name
where col.owner = 'AP'
and col.table_name = 'AP_INVOICES_ALL'
order by col.column_id;

B. If you have privilege on dba_tab_columns and dba_tables

select col.column_id, 
       col.owner as schema_name,
       col.table_name, 
       col.column_name, 
       col.data_type, 
       col.data_length, 
       col.data_precision, 
       col.data_scale, 
       col.nullable
from sys.dba_tab_columns col
inner join sys.dba_tables t on col.owner = t.owner 
                              and col.table_name = t.table_name
where col.owner = 'AP'
and col.table_name = 'AP_INVOICES_ALL'
order by col.column_id;

Columns

column_id - sequence number of the column as created
schema_name - table owner, schema name
table_name - table name
column_name - column name
data_type - column datatype
data_length - column length in bytes
data_precision - length:
- for NUMBER - decimal digits,
- for FLOAT - binary digits;
data_scale - digits to right of decimal point in a number
nullable - flag indicating if column allows nulls values

Rows

One row represents one column in a specific table in a database
Scope of rows: (A) all columns of a specific table accessible to the current user in Oracle database, (B) all columns of a specific table in Oracle database
Ordered by column sequence number