Convert SQL Query to Linq (contains left joins)

Question

I have a query that works perfectly in SQL, but I\'m having the damnedest time converting it to linq. The table (Table1 below) holds status changes for multiple record types

Answer 1

I think a direct translation of your SQL would look like this:

var q = from ds in table1
        where ds.SubmissionTypeId == 1 || ds.SubmissionTypeId == 2
        from di in table2
        from dr in table2
        where (ds.SubmissionTypeId == 2 && ds.SubmissionId == di.Id)
           || (ds.SubmissionTypeId == 1 && ds.SubmissionId == dr.Id)
        select ds;

However, it seems unlikely that this is what you want. If I may speculate about what your intended logic is, I think you want something more like this:

var q = from ds in table1
        where (ds.SubmissionTypeId == 2 && table2.Any(di => ds.SubmissionId == di.Id))
           || (ds.SubmissionTypeId == 1 && table3.Any(dr => ds.SubmissionId == dr.Id))
        select ds;