In this post, I am sharing one script to copy your Schema tables into another Schema of PostgreSQL.
I found this script at wiki.postgresql.org and modified the coding standard for the best use.

In our organization, I am creating a different schema for all the database developers, and at every new schema, we require to migrate development origin schema’s table data into a newly created schema.

I created different database users for each database developer, and they can only access their assigned schema. I am doing this for security reason, and it is also very easy to audit the changes and work progress of all the database developers.

Create a below function and execute to migrate your schema.

Create a function to copy old schema data to new schema:

CREATE OR REPLACE FUNCTION fn_CopySchemaData(source_schema text, dest_schema text) 
RETURNS void AS
$$
 
DECLARE
  object text;
  buffer text;
  default_ text;
  column_ text;
BEGIN

	-- Create a new schema
	EXECUTE 'CREATE SCHEMA ' || dest_schema; 
  
FOR object IN
	SELECT sequence_name::text 
	FROM information_schema.SEQUENCES 
	WHERE sequence_schema = source_schema
LOOP
	EXECUTE 'CREATE SEQUENCE ' || dest_schema || '.' || object;
END LOOP;
 
FOR object IN
	SELECT TABLE_NAME::text 
	FROM information_schema.TABLES 
	WHERE table_schema = source_schema
LOOP
	buffer := dest_schema || '.' || object;
	EXECUTE 'CREATE TABLE ' || buffer || ' (LIKE ' || source_schema || '.' || object || ' INCLUDING CONSTRAINTS INCLUDING INDEXES INCLUDING DEFAULTS)';
 
	FOR column_, default_ IN
		SELECT column_name::text, REPLACE(column_default::text, source_schema, dest_schema) 
		FROM information_schema.COLUMNS 
		WHERE table_schema = dest_schema 
			AND TABLE_NAME = object 
			AND column_default LIKE 'nextval(%' || source_schema || '%::regclass)'
	LOOP
	EXECUTE 'ALTER TABLE ' || buffer || ' ALTER COLUMN ' || column_ || ' SET DEFAULT ' || default_;
	END LOOP;
END LOOP;
 
END;
 
$$ LANGUAGE plpgsql VOLATILE;

Sample Execution:

select *from fn_CopySchemaData('old_schema','new_schema');