SELECT pr.id as process_id,
lo.update_time as start_date,
REPLACE(sc.message, 'ip.ip.ip.ip', lo.variables) as message,
sc.code
FROM logs AS lo
LEFT JOIN processes AS pr ON lo.process_id = pr.id
LEFT JOIN status_codes AS sc ON lo.status_code_id = sc.code
ORDER BY lo.id DESC
LIMIT 14
該查詢的問題是它將process_id作爲所有NULL值返回,即使這是該表的自動遞增主鍵而沒有任何NULL值。MySQL:將主鍵返回爲空