CREATE TABLE problem_log (problem_log_id VARCHAR, problem_id VARCHAR, log_entry_date VARCHAR)

What is the oldest log id and its corresponding problem id?
SELECT problem_log_id, problem_id FROM problem_log ORDER BY log_entry_date LIMIT 1
SELECT "problem_log_id", "problem_id" FROM "problem_log" ORDER BY "log_entry_date" NULLS FIRST LIMIT 1