sql CASE WHEN 使用

select 
                sp.researchId,
                d.name doctorName,

                p.name patientName,


                h.name hospitalName,
                    ad3.`name` provinceName,
                    ad2.`name` cityName,
                a.`name` districtName,

CASE WHEN h.address is NULL
                    THEN d.address

                    ELSE h.address END address,

                CASE WHEN ra.audits = 0
                    THEN '待审核'
                    WHEN ra.audits = 1 THEN '审核中'
WHEN ra.audits = 3 THEN '脱落'
WHEN ra.audits = 4 THEN '中止'
WHEN ra.audits = 5 THEN '初审（不通过）'
WHEN ra.audits = 6 THEN '初审（通过）'
WHEN ra.audits = 7 THEN '审核通过'
WHEN ra.audits = 8 THEN '审核不通过'
                    ELSE '未知' END audits
                from survey_patient sp
                INNER JOIN research_audits ra on ra.research_id=sp.researchId
                INNER JOIN doctor d on d.happyness_id=sp.happyness_id_doctor
                INNER JOIN hospital h on h.id=d.hospital_id
                INNER JOIN address a on a.id=h.district_id
                INNER JOIN patient p on p.happyness_id=sp.happyness_id_patient
                LEFT JOIN address ad2 on ad2.id=a.parent_id
                LEFT JOIN address ad3 on ad3.id=ad2.parent_id

                GROUP BY sp.researchId