Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE customers ( customer_details VARCHAR, staff_details VARCHAR )
TABLE: CREATE TABLE staff ( customer_details VARCHAR, staff_details VARCHAR )

### Question ###
Find the names of all the customers and staff members.

### Accurate SQL ###

SELECT customer_details FROM customers UNION SELECT staff_details FROM staff