lookup_itemstatus ON lookup_itemstatus.item_status_id = item.item_statusLEFT JOINlookup_danger ON lookup_danger.danger_id = item.danger_flag
LEFTJOINlookup_mso ON
SELECT * FROM assessmentON assessment_type.assessment_type_pk = assessment_assessment_type_lookup.assessment_type_fkLEFT JOIN assessment as assLEFTJOIN uni
显示为null的记录以供评估 FROM unit ON unit_unit_outcome_lookup.unit_fk= unit.unit_pk ON unit_outcome.unit_outcome_pk = unit_unit_outcome_lookup.unit_outcome_fkleft JOIN unit_o