SELECT
e.id, e.evaluation_name, e.grade, e.position_id, e.position_type,
e.tags, e.main_image, e.image_album, e.detail, e.price,
e.on_time, e.down_time, e.status,
e.tenant_id, e.create_dept, e.create_by, e.create_time,
e.update_by, e.update_time, e.remark, e.del_flag,
oss.url AS main_image_url,
p.post_name AS position_name
FROM main_exam_evaluation e
LEFT JOIN sys_oss oss ON e.main_image = oss.oss_id
LEFT JOIN main_position p ON e.position_id = p.id