c# left join linq
var query = from person in people
join pet in pets on person equals pet.Owner into gj
from subpet in gj.DefaultIfEmpty()
select new { person.FirstName, PetName = subpet?.Name ?? String.Empty };linq join
var id = 1;
var query =
from post in database.Posts
join meta in database.Post_Metas on post.ID equals meta.Post_ID
where post.ID == id
select new { Post = post, Meta = meta };linq left join
IQueryable<Job> jobs = (from j in _db.Jobs
join jt in _db.JobTranslators on j.Id equals jt.JobId into jts
from jtResult in jts.DefaultIfEmpty()
join jr in _db.JobRevisors on jtResult.Id equals jr.JobId into jrs
from jrResult in jrs.DefaultIfEmpty()
join u in _db.Users on jtResult.UserId equals u.Id into jtU
from jtUResult in jtU.DefaultIfEmpty()
where jtUResult.Id == userId
orderby j.Id
select j).Concat(
from j in _db.Jobs
join jt in _db.JobTranslators on j.Id equals jt.JobId into jts
from jtResult in jts.DefaultIfEmpty()
join jr in _db.JobRevisors on jtResult.Id equals jr.JobId into jrs
from jrResult in jrs.DefaultIfEmpty()
join u in _db.Users on jrResult.UserId equals u.Id into jrU
from jrUResult in jrU.DefaultIfEmpty()
where jtUResult.Id == userId
orderby j.Id
select j
).Distinct()right outer join in linq sql
using (JoinEntities Context = new JoinEntities())
{
var rightOuterJoin = from d in Context.DepartmentMasters
join e in Context.EmployeeMasters on d.DepartmentId equals e.DepartmentId into emp
from employee in emp.DefaultIfEmpty()
select new
{
EmployeeCode = employee.Code,
EmployeeName = employee.Name,
DepartmentName = d.Name
};
Console.WriteLine("Employee Code\tEmployee Name\tDepartment Name");
foreach (var data in rightOuterJoin)
{
Console.WriteLine(data.EmployeeCode + "\t\t" + data.EmployeeName + "\t" + data.DepartmentName);
}
}Copyright © 2021 Codeinu
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