LINQ

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ID:432,Name:Jones,SerialNumber:345,Device:A1
ID:432,Name:Mark,SerialNumber:347,Device:A1
ID:432,Name:Ann,SerialNumber:346,Device:A2

select a.LoanNum, PromiseAmt, isnull(SUM(PdAmt), 0) as PostedAmt
 from LoanPromises a with(nolock)
 left outer join LoanPayment lp with(nolock) on a.LoanNum = lp.LoanNum and a.PromiseDt < lp.PmtPostDt
 group by a.LoanNum, PromiseAmt
 having isnull(Sum(PdAmt),0) < PromiseAmt
 
Here is my linq query
 
var query = from pmts in oLoan.LoanPayments
     join promise in oLoan.LoanPromiseToPays
    on new { p1 = pmts.LoanNum, p2 = pmts.PmtPostDt} equals new {LoanNum = promise.LoanNum, PmtPostDt = promise.PromiseDt } into outer
 from defaulted in outer.DefaultIfEmpty()
 group defaulted by promise.LoanNum && promise.PromiseAmt into grouped
 select new
 {
    LoanNum = grouped.Key,
    Sum = grouped.Sum(t => t.PdAmt < t.PromiseAmt),
    PmtPostDt = promise.PromiseDt ?? default(DateTime)
 }
 

  var PeopleRecordsSearch = from SomePeople in Person()
                                          join SomeClient in Client() on SomePeople.PersonID equals SomeClient.PersonID
                                          where SomePeople.Surname.Contains(Surname) && SomePeople.Surname.Length > 0 && SomeClient.Postcode == Postcode 
                                          select SomePeople;

Func<Tables.Person, bool> WhereSurname = p => p.Surname = Surname;

PeopleRecordSearch.Where(WhereSurname).ToList();

Func<Tables.Client, bool> WherePostcode = p => p.Postcode == Postcode;

select SUM(total)
from MyTax mt1
inner join (
select Code,ID,TaxYear,Data,max(date) as FinalDate
from MyTax
group by Code,ID,TaxYear,Data) mt2
on mt1.Code = mt2.Code and mt1.ID = mt2.ID
and mt1.Data = mt2.Data and mt1.TaxYear = mt2.TaxYear
and mt1.date = mt2.date