oracle分组查询,获取组内所有信息(拼接显式)

使用listagg函数实现

语法结构

listagg(measure_expr，delimiter) within group ( order by order_by_clause);

解释：measure_expr可以是基于任何列的表达式

　　delimiter分隔符，默认为NULL

　　order_by_clause决定了列值的拼接顺序

 

举例

create table emp1(s1 number, s2 number);
insert into emp1 values(1,1);
insert into emp1 values(1,2);
insert into emp1 values(1,3);
insert into emp1 values(2,4);
insert into emp1 values(2,5);


select s1, listagg(s2,',')within group(order by s2) name from emp1 group by s1;
select listagg(s2,',')within group(order by s1)name from emp1;