Repository

public class ProjectRepository : AudianceRepositoryBase<Project, Guid>, IProjectRepository
{
    public ProjectRepository(AudianceDbContext dbContext) : base(dbContext)
    {
    }

    public bool SearchAuditLocation(string sqlQuery)
    {
        var retValue = false;
        var conn = Context.Database.GetDbConnection();
        try
        {
            conn.Open();
            using (var command = conn.CreateCommand())
            {
                command.CommandText = sqlQuery;
                var reader = command.ExecuteReader();
                if (reader.HasRows)
                {
                    retValue = true;
                }
                reader.Dispose();
            }
        }
        finally
        {
            conn.Close();
        }
        return retValue;
    }

}

Raw SQL in EF Core

http://www.learnentityframeworkcore.com/raw-sql

https://docs.microsoft.com/en-us/aspnet/core/data/ef-mvc/advanced