CREATE OR REPLACE VIEW type_category_summary AS
WITH type_count AS ( SELECT type, category(stream_name) AS category, COUNT(id) AS message_count FROM messages GROUP BY type, category ), total_count AS ( SELECT COUNT(id)::decimal AS total_count FROM messages ) SELECT type, category, message_count, ROUND((message_count / total_count)::decimal * 100, 2) AS percent FROM type_count, total_count ORDER BY type, category;