写完之后运行发现报错 但是不知道什么原因

select distinct case when a.AREACODE = 211200 then '铁岭市' when a.areacode = 211202 then '铁岭市银州区' when a.areacode = 211204 then '铁岭市清河区'
when a.areacode = 211221 then '铁岭市铁岭县' when a.areacode = 211212 then '铁岭市西丰县' when a.areacode = 211202 then '铁岭市昌图县'
when a.areacode = 211240 then '铁岭市经济开发区' when a.areacode = 211281 then '铁岭市调兵山市' when a.areacode = 211282 then '铁岭市开原市'
when a.areacode = 211223 then '铁岭市西丰市' when a.areacode = 211224 then '铁岭市昌图市'
when a.areacode = 211299 then '铁岭市市本级' else a.areacode end 分管机构,a.MEDICAL_TYPE 病人类别,a.name 姓名,a.PATIENT_NO 住院号,a.DEPT_NAME 住院科室,b.HOUSE_DOC_NAME 住院医师,a.In_Date 入院日期,a.Out_Date 出院日期,
b.Balance_Date 结算日期,case BALANCE_STATE when 1 then '结账' end as 状态,TOT_COST as 医疗费用总额,
OWN_COST as 个人现金金额,FIT_SCOPE_COST as 符合政策范围金额,ITEM_YLCOST as 实际支付起付线,
FUND_PAY_TOT_COST as 基金支付总额,PUB_COST_RATIO as 基本医疗保险统筹基金支付比例,GWYSUPPLYMEDSELFPAYRATIO_COST as 公务员补充医疗自付比例,ENTERSUPPLY_MEDICALINSPAY_COST as 企业补充医疗保险支付,RESIDENT_INSU_FUND_PAY_COST as 居民大病保险资金支出,
MEDICAL_AID_FUND_PAY_COST as 医疗救助基金支出,OTHER_FUND_PAY_COST as 其他支出,PUB_COST_RATIO as 基本医疗保险统筹基金支付比例,BASE_COST as 个人自付金额,
PAY_COST as 帐户支付,ALL_SELF_COST as 超限价自费费用,
from fin_ipr_siinmaininfo a left join fin_ipr_inmaininfo b on a.patient_no=b.inpatient_no

你from 前面多了一个逗号， 超限价自费费用, 这里的逗号需要删掉