How to select Sum of Days between two dates with join

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i have two tables one is UserTable and another is Usercompanies Table

UserTable field
1. UserId
2. UserName
3. Graduation

UserCompanies
1. Id
2. UserId
3. Company Name
4. Joining Date
5. Leaving Date
5. Currently Working

i want to select those users which have to more then 2 years experience on basis of joining and leaving date. user companies may be more then one and user can currently working in maximum 3 companies.
UserId of UserTable is foreigen key in UserCompanies Table

so please suggest me query for that

Posted 3-Apr-15 19:02pm

Hari Ram Jat

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George Jonsson 4-Apr-15 1:50am

You want to do this in c# and LINQ not SQL, right?

2 solutions

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Peter Leow · Answer 1 · 2015-04-03T19:29:00

Solution 1

To come up with a solution for your question, you will need to learn about:
1. Visual Representation of SQL Joins[^]
2. http://www.w3schools.com/sql/func_datediff.asp[^]
Try to attempt it yourself first. If you are stuck while trying, then post a new question with code to ask for advice.

Posted 3-Apr-15 19:29pm

Peter Leow

Updated 3-Apr-15 19:31pm

v2

Comments

Maciej Los 4-Apr-15 13:45pm

+5 for general advice!

Peter Leow 4-Apr-15 23:03pm

Thank you, Maciej.

George Swan · Answer 2 · 2015-04-04T07:19:00

Solution 2

C#

var query1 = UserCompanies.Where(uc => (uc.LeavingDate - uc.JoiningDate).TotalDays > 730);
var query2 =
    UserTable.Join(
                  query1,
                  u => new { u.UserId },
                  c => new { UserId = c.Id },
                  (u, c) => new { u.UserName, c }).ToList();

Posted 4-Apr-15 7:19am

George Swan

Comments

Maciej Los 4-Apr-15 13:45pm

+5 Looks perfect!
I'd do that using one query...