RosettaCodeData/Task/Top-rank-per-group/SQL/top-rank-per-group-2.sql

95 lines
3.1 KiB
SQL

select case LINE
when 10 then
'Tot.' || LPAD(POPULATION, 2) || ' Employees in ' || TIE_COUNT ||
' deps.Avg salary:' || TO_CHAR(SALARY, '99990.99')
when 30 then
'-'
when 50 then
'Department: ' || DEPT_ID || ', pop: ' || POPULATION ||
'. Avg Salary: ' || TO_CHAR(SALARY, '99990.99')
when 70 then
LPAD('Employee ID', 14) || LPAD('Employee name', 20) ||
LPAD('Salary', 9) || 'Rank'
when 90 then
LPAD('+', 14, '-') || LPAD('+', 20, '-') || LPAD('+', 9, '-') ||
LPAD('+', 4, '-')
else
LPAD(' ', 8) || LPAD(EMP_ID, 6) || LPAD(EMP_NAME, 20) ||
TO_CHAR(SALARY, '99990.99') || LPAD(case when TIE_COUNT = 1 then ' ' else 'T' end || RANK, 4)
end "Top rank per group"
from (select 10 LINE
,null EMP_ID
,null EMP_NAME
,' ' DEPT_ID
,avg(SALARY) SALARY
,0 RANK
,count(distinct DEPT_ID) TIE_COUNT
,count(*) POPULATION
from EMP
union all
select 30 LINE
,null EMP_ID
,null EMP_NAME
,DEPT_ID
,0 SALARY
,0 RANK
,0 TIE_COUNT
,0 POPULATION
from EMP
group by DEPT_ID
union all
select 50 LINE
,null EMP_ID
,null EMP_NAME
,DEPT_ID
,avg(SALARY) SALARY
,0 RANK
,0 TIE_COUNT
,count(*) POPULATION
from EMP
group by DEPT_ID
union all
select 70 LINE
,null EMP_ID
,null EMP_NAME
,DEPT_ID
,0 SALARY
,0 RANK
,0 TIE_COUNT
,0 POPULATION
from EMP
group by DEPT_ID
union all
select 90 LINE
,null EMP_ID
,null EMP_NAME
,DEPT_ID
,0 SALARY
,0 RANK
,0 TIE_COUNT
,0 POPULATION
from EMP
group by DEPT_ID
union all
select 110 LINE
,EMP_ID
,EMP_NAME
,DEPT_ID
,SALARY
,(select count(distinct EMP4.SALARY)
from EMP EMP4
where EMP4.DEPT_ID = EMP3.DEPT_ID
and EMP4.SALARY >= EMP3.SALARY) RANK
,(select count(*)
from EMP EMP2
where EMP2.DEPT_ID = EMP3.DEPT_ID
and EMP2.SALARY = EMP3.SALARY) TIE_COUNT
,0 POPULATION
from EMP EMP3
where $topN >= -- Here is the meat, Correlated subquery
(select count(distinct EMP4.SALARY)
from EMP EMP4
where EMP4.DEPT_ID = EMP3.DEPT_ID
and EMP4.SALARY >= EMP3.SALARY))
order by DEPT_ID ,LINE ,SALARY desc, EMP_ID;