CREATE TABLE statements (statement_id DECIMAL, statement_details TEXT)
CREATE TABLE accounts (account_id DECIMAL, statement_id DECIMAL, account_details TEXT)
CREATE TABLE ref_budget_codes (budget_type_code TEXT, budget_type_description TEXT)
CREATE TABLE ref_document_types (document_type_code TEXT, document_type_name TEXT, document_type_description TEXT)
CREATE TABLE documents_with_expenses (document_id DECIMAL, budget_type_code TEXT, document_details TEXT)
CREATE TABLE projects (project_id DECIMAL, project_details TEXT)
CREATE TABLE documents (document_id DECIMAL, document_type_code TEXT, project_id DECIMAL, document_date TIME, document_name TEXT, document_description TEXT, other_details TEXT)

Show ids for all documents in type CV without expense budgets.
SELECT document_id FROM documents WHERE document_type_code = "CV" EXCEPT SELECT document_id FROM documents_with_expenses
SELECT "document_id" FROM "documents" WHERE "CV" = "document_type_code" EXCEPT SELECT "document_id" FROM "documents_with_expenses"