--- 如果s_prepfieldtwo字段值为空则取字段 s_prepfieldone的值
select value(s_prepfieldtwo,s_prepfieldone) s_prepfieldtwo from TA_table_name where s_orgcode='230000000002'
select coalesce (s_prepfieldtwo,s_prepfieldone) s_prepfieldtwo from TA_table_name where s_orgcode='230000000002'
---利用count(必须有列函数group by )函数看是否有重复数据
select S_BOOKORGCODE, S_PAYERACCT , count(*) from TA_table_name where 1=1 group by S_BOOKORGCODE, S_PAYERACCT having count(*) >1;
--- 利用distinct函数和min函数进行数据去重复
SELECT distinct S_BOOKORGCODE,min (S_PAYERNAME)as S_PAYEENAME ,S_PAYERACCT,min (S_ENROLERID)as S_ENROLERID ,min (S_BANKTYPE) as S_BANKTYPE
FROM TA_table_name group by S_BOOKORGCODE,S_PAYERACCT