原始数据:要求将ASSETUNITID拆成多行展示，r_id是主键
展示效果:将ASSETUNITID拆成多行，别名取为assid
实现的sql:
selectr_id,INSTANCEID,o_name,o_code,o_type,d_flag,imp_date,pipe_id,src_r_id,fundid,b.assid ,accountid,PRODUCTID,usedate,name,sxrqfrom STRUCTURE_INFOa
left join (
SELECT distinct regexp_substr(ASSETUNITID, ‘[^,]+‘, 1, LEVEL) AS assid ,r_id as rid
FROM STRUCTURE_INFO
CONNECT BY LEVEL <= length(ASSETUNITID) -
length(REPLACE(ASSETUNITID, ‘,‘)) + 1)b
