how to get table description in postgresql code example

Example 1: view detailed table schema postgresql

-- All information
SELECT * FROM information_schema.columns
WHERE table_schema = 'some_schema'
AND TABLE_NAME = 'some_table';

-- Or a more simplified version

SELECT
   table_name,
   column_name,
   data_type
FROM
   information_schema.columns
WHERE
   table_name = 'some_table';

Example 2: describe table postgres

postgres=# \d schema.tablename;

Example 3: postgre describe table

SELECT 
   table_name, 
   column_name, 
   data_type 
FROM 
   information_schema.columns
WHERE 
   table_name = 'city';