Question

I have a table Sentences that has an ID and Sentence column. This is a fairly large table, +- 100000 rows. I am given a list of words and I need to find the sentences that contains these words. The resultant sentences must be unique.

_session.All<Sentence>()
        .Select(T => new { ID = T.ID, Sentences = T.sentence.Split(' ') })
        .Where(S => S.Sentences.Intersect(Words).Count()>0)
        .Select(R=>R.ID)

from here it’s pretty simple but this seems inefficient.

Answer 1

Instead of .Count()>0 you should use .Any().

Also, it does not appear as though you are doing anything to get unique sentences, like use a .Distinct() at the end.

Maybe like this:

_session.All<Sentence>()
        .Select(T => new { ID = T.ID, Sentences = T.sentence.Split(' ') })
        .Where(S => S.Sentences.Intersect(Words).Any())
        .Select(R=>R.ID)
        .Distinct() // may not be necessary