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aromig/linq_leftjoins.cs

Last active Jun 2, 2016
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Entity LINQ to SQL Left Joins
// Example of multiple LEFT OUTER JOINs in LINQ query syntax
// Equivalent of: SELECT <blahblah> FROM requests r LEFT JOIN employees e ON e.emplid = r.emplid LEFT JOIN employees m ON m.emplid = r.mgrid LEFT JOIN locations l ON l.locid = request.locid
using System.Linq;
using (Entities db = new Entities())
{
var rows =
from request in db.requests
from employee in db.employees.Where(e => e.emplid == request.emplid).DefaultIfEmpty()
from manager in db.employees.Where(m => m.emplid == request.mgrid).DefaultIfEmpty()
from location in db.locations.Where(l => l.locid == request.locid).DefaultIfEmpty()
select new { Request = request, Employee = employee, Manager = manager, Location = location };
}
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