Question

How can I write below sql query in linq

select * from Product where ProductTypePartyID IN
(
    select Id from ProductTypeParty where PartyId = 34
)

Answer 1

Syntactic variations aside, you can write it in practically the same way.

from p in ctx.Product
where (from ptp in ctx.ProductTypeParty
       where ptp.PartyId == 34
       select ptp.Id).Contains(p.ProductTypePartyID)
select p

I prefer using the existential quantifier, though:

from p in ctx.Product
where (from ptp in ctx.ProductTypeParty
       where ptp.PartyId == 34
       && ptp.Id == p.ProductTypePartyID).Any()
select p

I expect that this form will resolve to an EXISTS (SELECT * ...) in the generated SQL.

You’ll want to profile both, in case there’s a big difference in performance.