Question

我在编写PL / SQL语句时难以显示以下输出。

这些是我的表格：

员工（E＃，FName，LName，...）
SkillPossessed（E＃，SName，Level）（员工可能拥有超过1项技能）

我需要显示输出如下：

1 Mary Loo:Sewing,Dancing,Cooking
2 Peter Pan:Painting, Singing
...

我该怎么做？

由于

Answer 1

不需要PL / SQL，只需使用LISTAGG。

create table employee (id number, fname varchar2(20), lname varchar2(20), primary key (id));
create table skillpossessed(employee_id number, sname varchar2(20), lvl number, constraint fk_employee_id foreign key(employee_id) references employee(id));
insert into employee values (1, 'Mary', 'Loo');
insert into employee values (2, 'Peter', 'Pan');
insert into skillpossessed values (1, 'Sewing', 1);
insert into skillpossessed values (1, 'Dancing', 2);
insert into skillpossessed values (1, 'Cooking', 5);
insert into skillpossessed values (2, 'Painting', 3);
insert into skillpossessed values (2, 'Singing', 1);

select e.id, e.fname, e.lname, listagg (s.sname, ',') 
within group (order by s.sname) as skills 
from employee e, skillpossessed s 
where e.id = s.employee_id group by e.id, e.fname, e.lname;

        ID FNAME  LNAME SKILLS
---------- ------ ----- ----------------------
         1 Mary   Loo   Cooking,Dancing,Sewing
         2 Peter  Pan   Painting,Singing

PL / SQL显示结果

1 个答案: