Read all tables and columns that have some a/i attribute as index, serial, identity

read_db_schema_table_column_connections.sql

CREATE OR REPLACE VIEW identity_column_status AS
WITH table_data AS (
	SELECT
		t.table_catalog, t.table_schema, t.table_name,
		t.table_schema || '.' || t.table_name AS schema_table_name
	FROM
		information_schema.tables AS t
	WHERE
		t.table_type = 'BASE TABLE'
		AND t.table_schema NOT IN ('information_schema', 'pg_catalog')
)
SELECT
	t.table_catalog, t.table_schema, t.table_name, t.schema_table_name,
	c.column_name, c.column_default, c.data_type,
	tc_ccu.constraint_name, tc_ccu.constraint_type,
	dep.deptype,
	CASE
		WHEN dep.deptype = 'a' AND c.column_default IS NULL THEN 'INDEX'
		WHEN dep.deptype = 'a' AND c.column_default IS NOT NULL THEN 'SERIAL'
		WHEN Dep.deptype = 'i' THEN 'IDENTITY'
		ELSE 'UNKNOWN'
	END::VARCHAR AS column_setting
FROM
	table_data AS t,
	information_schema.columns AS c
	LEFT JOIN (
		SELECT
			ccu.table_catalog, ccu.table_schema, ccu.table_name, ccu.column_name,
			ccu.constraint_catalog, ccu.constraint_schema, ccu.constraint_name,
			tc.constraint_type
		FROM
			table_data AS t,
		 	information_schema.table_constraints AS tc,
		 	information_schema.constraint_column_usage ccu
		 WHERE
			t.table_name = tc.table_name
			AND tc.constraint_type <> 'FOREIGN KEY'
		 	AND tc.constraint_catalog = ccu.constraint_catalog
			AND tc.constraint_schema = ccu.constraint_schema
			AND tc.constraint_name = ccu.constraint_name
	) AS tc_ccu ON (
		tc_ccu.table_catalog = c.table_catalog
		AND tc_ccu.table_schema = c.table_schema
		AND tc_ccu.table_name = c.table_name
		AND tc_ccu.column_name = c.column_name
	),
	pg_depend AS dep
WHERE
	t.table_catalog = c.table_catalog
	AND t.table_schema = c.table_schema
	AND t.table_name = c.table_name
	AND dep.classid = 'pg_class'::regclass::oid AND dep.refobjid = (
		SELECT oid FROM pg_class WHERE relnamespace = (
			SELECT oid FROM pg_namespace WHERE nspname = t.table_schema
		) AND relname = t.table_name
	) AND dep.refobjsubid = (
		SELECT attnum FROM pg_attribute WHERE attrelid = (
			SELECT oid FROM pg_class WHERE relnamespace = (
				SELECT oid FROM pg_namespace WHERE nspname = t.table_schema
			) AND relname = t.table_name
		) AND attname = c.column_name::name
	)
	AND dep.objsubid = 0
ORDER BY
	t.table_catalog, t.table_schema, t.table_name, c.column_name
;