• Status: Solved
  • Priority: Medium
  • Security: Private
  • Views: 62
  • Last Modified:

Select multiple tables in LINQ

Hi Experts,

I have this SQL query statement:

SELECT d1.*
FROM FinanceDept d1
INNER JOIN
(SELECT User_ID, MAX(SalesAmt) AS 'Amount' FROM SalesDept GROUP BY User_ID) d2
ON d1.User_ID = d2.User_ID AND d1.Amount= d2.Amount

But I don't know how to write it in LINQ and Lambda expression.
Please help.

Thank you
0
alexcryout
Asked:
alexcryout
  • 2
  • 2
2 Solutions
 
Éric MoreauSenior .Net ConsultantCommented:
0
 
Fernando SotoRetiredCommented:
Hi alexcryout;

Try this query and see if it returns the required results.

var results = from d1 in FinanceDept
              join d2 in SalesDept on new { d1.User_ID, d1.Amount  } equals new { d.OrderID, d2.Amount } into userGroup
              orderby d1.User_ID
              select new 
              {
                 FinanceDept = d1,
                 User_ID_d2 = userGroup.Select( u => u.User_ID ).FirstOrDefault(),
                 Amount = userGroup.Max( a = a.SalesAmt )
              };

Open in new window

0
 
alexcryoutAuthor Commented:
Hi Fernando,

Sorry for my typo, I am trying to join the same table. The correct SQL statement is:

SELECT d1.*
 FROM FinanceDept d1
 INNER JOIN
 (SELECT User_ID, MAX(SalesAmt) AS 'Amount' FROM FinanceDept GROUP BY User_ID) d2
 ON d1.User_ID = d2.User_ID AND d1.Amount= d2.Amount

Thanks
0
 
Fernando SotoRetiredCommented:
Hi alexcryout;

Just substitute the table name SalesDept with FinanceDept as shown in this line of the query and that should do it.

(SELECT User_ID, MAX(SalesAmt) AS 'Amount' FROM FinanceDept GROUP BY User_ID) d2
0
 
alexcryoutAuthor Commented:
It works fine but I download the Linqer tool and its solution is much better.

Thank you for all your helps.
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Ultimate Tool Kit for Technology Solution Provider

Broken down into practical pointers and step-by-step instructions, the IT Service Excellence Tool Kit delivers expert advice for technology solution providers. Get your free copy now.

  • 2
  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now