Return all the information for all employees without any department number.
CREATE TABLE employees (department_id VARCHAR)
SELECT * FROM employees WHERE department_id = "null"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE employees (department_id VARCHAR) Question: Return all the information for all employees without any department number. [/INST] SELECT * FROM employees WHERE department_id = "null" </s>