ORACLE 实用 慢慢更新^_^

1.分组求最
 
select xx.qssj from(select cm.persionid,cm.qssj,row_number() over(partition by cm.persionid order by cm.scrq desc) as rn
                from RS_RSK_CONTRACT_MANAGE cm where cm.bak_flag is null) xx
     where xx.persionid=a.id and xx.rn=1 
 
2.记录合并
 
wm_sys.wm_concat
 
3.limit of 2000 byte
oracle 10g release 2 一下， release2及以上buffer size无上限。
(1)set serveroutput on size 1000000;
(2)exec dbms_output.enable(999999999999999999);