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 candidate_assessments (candidate_id VARCHAR, assessment_date VARCHAR)

### Question ###
Find id of the candidate who most recently accessed the course?

### Accurate SQL ###

SELECT candidate_id FROM candidate_assessments ORDER BY assessment_date DESC LIMIT 1