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 problem_log ( problem_log_id VARCHAR, problem_id VARCHAR, log_entry_date VARCHAR )

### Question ###
What is the oldest log id and its corresponding problem id?

### Accurate SQL ###

SELECT problem_log_id, problem_id FROM problem_log ORDER BY log_entry_date LIMIT 1