Script: table_defs.sql

-- -----------------------------------------------------------------------------------
-- File Name    : https://oracle-base.com/dba/miscellaneous/table_defs.sql
-- Author       : Tim Hall
-- Description  : Lists the column definitions for the specified table.
-- Call Syntax  : @table_defs (tablee-name or all)
-- Last Modified: 24/09/2003
-- -----------------------------------------------------------------------------------
COLUMN column_id FORMAT 99
COLUMN data_type FORMAT A10
COLUMN nullable FORMAT A8
COLUMN size FORMAT A6
BREAK ON table_name SKIP 2
SET PAGESIZE 0
SET LINESIZE 200
SET TRIMOUT ON
SET TRIMSPOOL ON
SET VERIFY OFF

SELECT table_name,
       column_id,
       column_name,
       data_type,
       (CASE
         WHEN data_type IN ('VARCHAR2','CHAR') THEN TO_CHAR(data_length)
         WHEN data_scale IS NULL OR data_scale = 0 THEN TO_CHAR(data_precision)
         ELSE TO_CHAR(data_precision) || ',' || TO_CHAR(data_scale)
       END) "SIZE",
       DECODE(nullable, 'Y', '', 'NOT NULL') nullable
FROM   user_tab_columns
WHERE  table_name = DECODE(UPPER('&1'), 'ALL', table_name, UPPER('&1'))
ORDER BY table_name, column_id;

SET PAGESIZE 14
SET LINESIZE 80