分組數據聚合

數據庫版本：Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

一、創建測試數據：

 

create table test(id number,name varchar2(20));
insert into test values(1,'a');
insert into test values(1,'b');
insert into test values(1,'c');
insert into test values(2,'d');
insert into test values(2,'e');

 

二、多行數據的聚合

2.1 wm_concat

 

SELECT ID,
       to_char(wm_concat('['||NAME||ID||']')) colname
       FROM TEST GROUP BY ID

2.2 listagg

 

 

SELECT ID,
       listagg(NAME,'$') WITHIN GROUP(ORDER BY NAME) OVER(PARTITION BY ID) colname
       FROM TEST

SELECT ID,
       listagg(NAME,'$') WITHIN GROUP(ORDER BY NAME) colname
       FROM TEST
       GROUP BY ID

 

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