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oracle 11g的列转行函数介绍--listagg

原创 Oracle 作者:hb0860 时间:2014-05-04 17:40:22 0 删除 编辑
在ORACLE 11G中新增一个函数:LISTAGG(),使用感觉不错.感觉效率要高于:sys_connect_by_path
基本使用方法:
LISTAGG(COL_NAME,',') WITHIN GROUP( ORDER BY COL_NAME)
例子:
    with temp as(  
      select 'China' nation ,'Guangzhou' city from dual union all  
      select 'China' nation ,'Shanghai' city from dual union all  
      select 'China' nation ,'Beijing' city from dual union all  
      select 'USA' nation ,'New York' city from dual union all  
      select 'USA' nation ,'Bostom' city from dual union all  
      select 'Japan' nation ,'Tokyo' city from dual   
    )  
    select nation,listagg(city,',') within GROUP (order by city)  
    from temp  
    group by nation 
高级用法:
LISTAGG(COL_NAME,',') WITHIN GROUP( ORDER BY COL_NAME) over(partition by COL_NAME1)
例子:
with temp as(  
      select 500 population, 'China' nation ,'Guangzhou' city from dual union all  
      select 1500 population, 'China' nation ,'Shanghai' city from dual union all  
      select 500 population, 'China' nation ,'Beijing' city from dual union all  
      select 1000 population, 'USA' nation ,'New York' city from dual union all  
      select 500 population, 'USA' nation ,'Bostom' city from dual union all  
      select 500 population, 'Japan' nation ,'Tokyo' city from dual   
    )  
    select population,  
           nation,  
           city,  
           listagg(city,',') within GROUP (order by city) over (partition by nation) rank  
    from temp ;

例子来自:

dacoolbaby

感谢,省下写语句的时间。







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