SELECT s.SalesOrderID, OrderDate,ProductID
FROM Sales.SalesOrderHeader AS s
INNER JOIN Sales.SalesOrderDetail AS d ON s.SalesOrderID = d.SalesOrderID
ORDER BY s.SalesOrderID, ProductID


SELECT c.CustomerID, s.SalesOrderID
FROM Sales.Customer c
LEFT OUTER JOIN Sales.SalesOrderHeader s ON c.CustomerID = s.CustomerID


var q = from c in customers
join o in orders on c.Key equals o.Key
select new {c.Name, o.OrderNumber};



Left Join

var q2 = from c in dataContext.Customers join o in dataContext.Orders on c.CustomerID equals o.CustomerID into g from a in g.DefaultIfEmpty() select new { c.CustomerID, c.ContactName, a.OrderID, a.OrderDate };



Inner Join on multiple

//We mark our anonymous type properties as a and b otherwise//we get the compiler error "Type inferencce failed in the call to 'Join’ var q3 = from c in dataContext.Customers join o in dataContext.Orders on new { a = c.CustomerID, b = c.Country } equals new { a = o.CustomerID, b = "USA" } select new { c.CustomerID, c.ContactName, o.OrderID, o.OrderDate };