ORACLE 實用 慢慢更新^_^

1.分組求最

 

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.記錄合并

 

wm_sys.wm_concat

 

3.limit of 2000 byte

oracle 10g release 2 一下， release2及以上buffer size無上限。

(1)set serveroutput on size 1000000;

(2)exec dbms_output.enable(999999999999999999);