select business_unit, voucher_id, listagg( vat_txn_type_cd, ',') within group (order by business_unit, voucher_id) from ps_voucher_line a
where business_unit = 'CZ090'
and voucher_id like '%656'
group by business_unit, voucher_id;

--把一列值转化为一行用逗号隔开。 但是要去掉重的值

SELECT BUSINESS_UNIT,
VOUCHER_ID,
LISTAGG (VAT_TXN_TYPE_CD, ',')
WITHIN GROUP (ORDER BY BUSINESS_UNIT, VOUCHER_ID)
FROM (SELECT DISTINCT BUSINESS_UNIT, VOUCHER_ID, VAT_TXN_TYPE_CD
FROM PS_VOUCHER_LINE)
WHERE business_unit = 'CZ090' AND voucher_id LIKE '%656'
GROUP BY BUSINESS_UNIT, VOUCHER_ID

   listagg字符串拼接字符串过长问题解决用xmlagg方法

INSERT INTO PS_GM_DEPT_POS_HTM 
SELECT SETID 
,DEPTID 
,xmlagg(xmlparse(content '<div class =''left''>'||DESCR||'</div><div class =''right''>'||MAX_HEAD_COUNT||'</div>' wellformed) 
ORDER BY '<div class =''left''>'||DESCR||'</div><div class =''right''>'||MAX_HEAD_COUNT||'</div>').getclobval() ||'<div class=''one''></br></div>' 
,' ' 
FROM PS_GM_DEPT_POS_NUM 
GROUP BY SETID 
,DEPTID;

 regexp_replace(dbms_lob.substr('ssss'),'[^[:print:]]','')