Employee Salary Should display monthwise as moth displaying Horizontally as Headings - postgresql

Question

My requirement is as follows:
Am using Postgresql and ireport 4.0.1 for generating this report.
I've four tables like g_employee,g_year,g_period,g_salary, by joining these four tables and passing parameter are fromDate and toDate these parameter values like '01/02/14' between '01/05/14'.Based this parameters the displaying months will be vary in the headings as i shown in the below example:
EmpName
01/02/14 01/03/14 01/04/14 01/05/14
abc
2000 3000 3000 2000
Can anyone help me in this getting output?

Answer 1

What you're describing sounds like the number of columns would grow or shrink based on the number of months between the 2 parameters, which just doesn't work.
I don't know any way to add additional columns based on an interval between 2 parameters without a procedural code generated sql statement.
What is possible is:
emp_id1 period1 salary
emp_id1 period2 salary
emp_id1 period3 salary
epd_id1 period4 salary
emp_id2 period1 salary
emp_id2 period2 salary
emp_id2 period3 salary
epd_id2 period4 salary
generated with something like:
select g_employee_id,
g_period_start,
g_salary_amt
from g_employee, g_year, g_period, g_salary
where <join everything>
and g_period_start between date_param_1 and date_param_2
group by g_employee_id, g_period_start;
Hard to get more specific with out the table structure.
As the range between date_param_1 and date_param_2 grew, the number of rows would grow for each employee with pay in that "g_period"
EDIT - Other option:
The less dynamic option which requires more parameters would be:
select g_employee_id,
(select g_salary_amount
from g_period, g_salary
where g_period_id = g_salary_period_id
and g_salard_emp_id = g_employee_id
and g_period_start = <DATE_PARAM_1> ) as "DATE_PARAM_1_desc",
(select g_salary_amount
from g_period, g_salary
where g_period_id = g_salary_period_id
and g_salard_emp_id = g_employee_id
and g_period_start = <DATE_PARAM_2> ) as "DATE_PARAM_2_desc",
(select g_salary_amount
from g_period, g_salary
where g_period_id = g_salary_period_id
and g_salard_emp_id = g_employee_id
and g_period_start = <DATE_PARAM_3> ) as "DATE_PARAM_3_desc"
,..... -- dynamic not possible
from employee;

Answer 2

i create one table #g_employee and insert dummy data
create table #g_employee(empid int,yearid int,periodid int,salary int)
insert into #g_employee(empid,yearid,periodid,salary)
select 1,2014,02,2000
union
select 2,2014,02,2000
union
select 3,2014,02,2000
union
select 3,2014,03,2000
union
select 1,2014,03,3000
union
select 1,2014,04,4000
output query as per your requirement :
Solution 1 :
select empid, max(Case when periodid=2 and yearid=2014 then salary end) as '01/02/2014'
, max(Case when periodid=3 and yearid=2014 then salary end) as '01/03/2014'
, max(Case when periodid=4 and yearid=2014 then salary end) as '01/04/2014'
from #g_employee
group by empid
you can do with dynamic sql :
Solution 2 :
DECLARE #cols AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX)
select #cols = STUFF((SELECT ',' + QUOTENAME(periodid)
from #g_employee
group by periodid
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #query = 'SELECT empid,' + #cols + ' from
(
select salary, periodid,empid
from #g_employee
) x
pivot
(
max(salary)
for periodid in (' + #cols + ')
) p '
execute(#query)
hope this will help