Is there a more easy/more simple way to achieve this?
Good morning (afternoon to you, BluShadow).I got following exact, as you wish, output (derived from the EMP table):
D10 D20 D30 PREZ MGRS ANALS SALESM CLERKS
------- ------- ------- ------- ------- ------- ------- -------
CLARK JONES WARD KING BLAKE FORD ALLEN ADAMS
KING FORD TURNER CLARK SCOTT MARTIN JAMES
MILLER ADAMS ALLEN JONES TURNER MILLER
SMITH JAMES WARD SMITH
SCOTT BLAKE
MARTIN
by using the following query: with
--
-- pivoted departments (haven't studied the Oracle PIVOT clause yet)
--
depts as
(
select max(case deptno
when 10 then ename
end) as d10,
max(case deptno
when 20 then ename
end) as d20,
max(case deptno
when 30 then ename
end) as d30,
rnd
from (
select deptno,
ename,
row_number() over (partition by deptno
order by deptno) rnd
from emp
)
group by rnd
order by rnd
),
--
-- pivoted jobs
--
jobs as
(
select max(case job
when 'CLERK' then ename
end) as Clerks,
max(case job
when 'PRESIDENT' then ename
end) as Prez,
max(case job
when 'MANAGER' then ename
end) as Mgrs,
max(case job
when 'ANALYST' then ename
end) as Anals,
max(case job
when 'SALESMAN' then ename
end) as SalesM,
rnj
from (
select job,
ename,
row_number() over (partition by job
order by ename) as rnj
from emp
)
group by rnj
order by rnj
)
select d10,
d20,
d30,
Prez,
Mgrs,
Anals,
SalesM,
Clerks
from depts a full outer join jobs b
on a.rnd = b.rnj
order by rnj, rnd;
that takes a total of 5 selects to get there.I tried to find a query that would be, I hope more simple, easier and does not require as much selects. My last attempt is the following (which is closer to the desired result, but does not get a cigar yet):
select case deptno
when 10 then ename
end as d10,
case deptno
when 20 then ename
end as d20,
case deptno
when 30 then ename
end as d30,
case job
when 'CLERK' then ename
end as Clerks,
case job
when 'PRESIDENT' then ename
end as Prez,
case job
when 'MANAGER' then ename
end as Mgrs,
case job
when 'ANALYST' then ename
end as Anals,
case job
when 'SALESMAN' then ename
end as SalesM,
row_number() over (partition by deptno
order by deptno) as rnd,
row_number() over (partition by job
order by ename) as rnj
from emp
order by rnj;
The query above annoys me to this result which is encouraging, but... the brand:D10 D20 D30 CLERKS PREZ MGRS ANALS SALESM RND RNJ
------- ------- ------- ------- ------- ------- ------- ------- ---- ----
ALLEN ALLEN 3 1
ADAMS ADAMS 2 1
BLAKE BLAKE 6 1
KING KING 2 1
FORD FORD 1 1
SCOTT SCOTT 5 2
JAMES JAMES 5 2
CLARK CLARK 3 2
MARTIN MARTIN 2 2
TURNER TURNER 1 3
MILLER MILLER 1 3
D10 D20 D30 CLERKS PREZ MGRS ANALS SALESM RND RNJ
------- ------- ------- ------- ------- ------- ------- ------- ---- ----
JONES JONES 3 3
WARD WARD 4 4
SMITH SMITH 4 4
It uses a single SELECT statement and contains all the data that should be displayed, but I can't find a way to eliminate NULL values without losing a few jobs or departmentsYour help is welcome and appreciated,
John.
PS: I'll be perfectly happy to learn that there is no way more easy/simple. In other words, if the answer is simply "No, there no simpler or easier way", please let me know which is the case. (I ask that you be sure enough of that though, thank you)
Published by: 440bx - 11 GR 2 on July 25, 2010 07:19 - added PS.
According to the hoek' suggestion ;-)
SQL> select d10, d20, d30, prez, mgrs, anals, salesm, clerks
2 from (select row_number() over(partition by deptno order by ename) rn,
3 ename,
4 to_char(deptno) deptno
5 from emp
6 union all
7 select row_number() over(partition by job order by ename),
8 ename,
9 job
10 from emp) pivot(max(ename) for deptno in(10 d10,
11 20 d20,
12 30 d30,
13 'ANALYST' anals,
14 'CLERK' clerks,
15 'MANAGER' mgrs,
16 'PRESIDENT' prez,
17 'SALESMAN' salesm))
18 order by rn
19 /
D10 D20 D30 PREZ MGRS ANALS SALESM CLERKS
---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
CLARK ADAMS ALLEN KING BLAKE FORD ALLEN ADAMS
KING FORD BLAKE CLARK SCOTT MARTIN JAMES
MILLER JONES JAMES JONES TURNER MILLER
SCOTT MARTIN WARD SMITH
SMITH TURNER
WARD
6 rows selected.
Best regards
Maxim
Tags: Database
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