Question

I have two tables

Contracts

Id | StartDate | EndDate

ExcludedContracts

Id | ContractId

I am using the following statements to get both sets of data:

            var excludedContracts = from Excluded in 
            DataContext.ExcludedTransportContracts
                                    select Excluded;

            // Get a collection of all live sites first
            var liveContracts = from Contracts in DataContext.Contracts
                                where Contracts.EndDate > DateTime.Now
                                select Contracts;

I need to select all contracts that don’t have a record in the ExcludedContracts table. I’ve been battling with WHERE queries for a while but had no luck.

How do I do a query similar as I would an instatement IN(1,2,3) SQL?

Thanks!

Answer 1

Are the two tables not related at the data level? Ie a Contract object having a list of ExcludedTransportContracts as a property?

From the look of the data this is probably how they should be related, then you can do something like var liveContract = DataContext.Contracts.Where(c => c.ExcludedTransportContracts.Count() == 0 && c.EndDate > DateTime.Now )

Was off the top of my head so the code may need slight alterations.