SQL INNER JOIN with WHERE clause to LINQ format - sql

Question

How would I convert this sql query to LINQ?
SELECT company.ticker, company.primary_analyst,
personnel.last_name, company.research_associate,
company.secondary_associate, company.coverage_status
FROM company
INNER JOIN personnel ON company.primary_analyst = personnel.dpinitials
WHERE personnel.last_name='marley' AND company.associate='ml'
ORDER BY company.coverage_status

Answer 1

It's pretty similar:
var results = from c in company
join p in personnel on c.primary_analyst equals p.dpinitals
where p.last_name == 'marley' and c.associate == 'ml'
orderby c.coverage_status asc
select new
{
c.ticker, c.primary_analyst, p.last_name, c.research_associate,
c.secondary_associate, c.coverage_status
};
Above projects to an anonymous class with the properties you want - if you have an equivalent POCO class in your model you should project to that, if not in many cases you probably should create one.

Answer 2

The solution from #BrokenGlass is perfectly fine.
However, if you have a 1..many relationship it is rarely necessary to use the join operator in LINQ. In this example, if company->personell was 1..many, I would write the query like this:
var results = from c in company
where c.associate == "ml"
from p in c.personnel
where p.last_name == "marley"
orderby c.coverage_status asc
select new
{
c.ticker,
c.primary_analyst,
p.last_name,
c.research_associate,
c.secondary_associate,
c.coverage_status
};
This can also be written using the expression chain syntax:
var results = company.Where(c => c.associate == "ml")
.SelectMany(c => c.personnel, (c, p) => new
{
c.ticker,
c.primary_analyst,
p.last_name,
c.research_associate,
c.secondary_associate,
c.coverage_status
})
.Where(x => x.last_name == "marley")
.OrderBy(x => x.coverage_status)

Answer 3

var list = (from u in db.Users
join c in db.Customers on u.CustomerId equals c.CustomerId
where u.Username == username
select new {u.UserId, u.CustomerId, u.ClientId, u.RoleId, u.Username, u.Email, u.Password, u.Salt, u.Hint1, u.Hint2, u.Hint3, u.Locked, u.Active,c.ProfilePic}).First();