how to check schema in postgresql code example

Example: 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';