oracle分組查詢,獲取組內所有信息(拼接顯式)

使用listagg函數實現

語法結構

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

解釋：measure_expr可以是基於任何列的表達式

　　delimiter分隔符，默認為NULL

　　order_by_clause決定了列值的拼接順序

 

舉例

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;