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SQL calculate years from view

Posted on 2011-03-24
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Last Modified: 2012-05-11
I have a view that has a
EmployeeNumber, companyname, startdate, and enddate

I need to find a way to calculate years of experience for each employeenumber when they worked at the company MYCOMPANY, and also a total of all years worked at another company.

I don't care it this ends up being two rows in the same view for each employeenumber (only one if they don't have other experience), or two different views.



SELECT     EmpNo, CompanyName, Location, Title, StartDate, EndDate
FROM         dbo.EmpWorkHistory AS e
GROUP BY EmpNo, StartDate, EndDate, CompanyName, Location, Title
ORDER BY EmpNo, StartDate

so
1, Google, 1990-1-1, 1991-1-1
1, IBM, 1991-1-1, 1992-1-1
1, XXX, 1992-1-1, 1993-1-1
1, MyCompany, 1993-1-1, 1994-1-1

would give me
1, MyCompany, 1 Year
1, AllOtherCompanies, 3 Years

Thanks!
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Question by:jackjohnson44
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2 Comments
 
LVL 28

Accepted Solution

by:
Ryan McCauley earned 500 total points
ID: 35211038
Is this what you want?

SELECT CASE Company WHEN 'MyCompany' THEN 'MyCompany' ELSE 'AllOtherCompanies' END as Company,
       SUM(DATEDIFF(yy, StartDate, EndDate)) as YearsExperience
  FROM dbo.EmpWorkHistory AS e
GROUP BY CASE Company WHEN 'MyCompany' THEN 'MyCompany' ELSE 'AllOtherCompanies' END

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LVL 28

Assisted Solution

by:Ryan McCauley
Ryan McCauley earned 500 total points
ID: 35211069
Wow - I don't know what I was thinking - that's not at all what you want. Here's what you're looking for, and can do it in a single row per employee:

SELECT EmpNo, SUM(CASE Company WHEN 'MyCompany' THEN DATEDIFF(yy, StartDate, EndDate) ELSE 0 END) as YearsWithUs,
       SUM(CASE Company WHEN 'MyCompany' THEN 0 ELSE DATEDIFF(yy, StartDate, EndDate) END) as YearsSomewhereElse
  FROM dbo.EmpWorkHistory AS e
GROUP BY EmpNo

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