Показать работу, общее число сотрудников в рамках каждого задания из таблицы EMP

Question

Я хочу выход как:

---------- 

job   count   ename 
---------- 
salesman  4   name1 
          name2 
          name3 
          name4 

clerk   4   name1 
          name2 
          name3 
          name4 
manager  3   name1 
          name2 
          name3 
analyst  2   name1 
          name2 
president  1   name 

....... и так далее.

Нельзя повторять название задания и подсчитывать каждое имя в этой задаче. У меня есть ответ с повторением.

Answer 1

SQL Fiddle

Oracle 11g R2 Настройка схемы:

CREATE TABLE employee 
    ("job" varchar2(9), "ename" varchar2(5)) 
; 

INSERT ALL 
    INTO employee ("job", "ename") 
     VALUES ('salesman', 'name1') 
    INTO employee ("job", "ename") 
     VALUES ('salesman', 'name4') 
    INTO employee ("job", "ename") 
     VALUES ('clerk', 'name1') 
    INTO employee ("job", "ename") 
     VALUES ('clerk', 'name2') 
    INTO employee ("job", "ename") 
     VALUES ('manager', 'name1') 
    INTO employee ("job", "ename") 
     VALUES ('manager', 'name2') 
    INTO employee ("job", "ename") 
     VALUES ('manager', 'name3') 
    INTO employee ("job", "ename") 
     VALUES ('salesman', 'name2') 
    INTO employee ("job", "ename") 
     VALUES ('salesman', 'name3') 
    INTO employee ("job", "ename") 
     VALUES ('clerk', 'name3') 
    INTO employee ("job", "ename") 
     VALUES ('president', 'name') 
    INTO employee ("job", "ename") 
     VALUES ('clerk', 'name4') 
    INTO employee ("job", "ename") 
     VALUES ('analyst', 'name1') 
    INTO employee ("job", "ename") 
     VALUES ('analyst', 'name2') 
SELECT * FROM dual 
; 

Запрос 1:

SELECT case when j."ename" = firstname then j."job" else ' ' end as job, 
     case when j."ename" = firstname then cast(c.cnt as varchar(5)) else ' ' end as "count", 
     j."ename" 
FROM employee j 
INNER JOIN (SELECT "job", min("ename") as firstname, count(*) as cnt FROM employee GROUP BY "job") c ON c."job" = j."job" 
ORDER BY cnt desc, j."job", j."ename" 

Results:

|  JOB | COUNT | ENAME | 
|-----------|-------|-------| 
|  clerk |  4 | name1 | 
|   |  | name2 | 
|   |  | name3 | 
|   |  | name4 | 
| salesman |  4 | name1 | 
|   |  | name2 | 
|   |  | name3 | 
|   |  | name4 | 
| manager |  3 | name1 | 
|   |  | name2 | 
|   |  | name3 | 
| analyst |  2 | name1 | 
|   |  | name2 | 
| president |  1 | name |