string1> = string2在Linq to SQL中没有实现,任何workarround？

var query = from s in db.Strings
            where s.string1.CompareTo(s.string2) >= 0
            select s;

public static bool CompareStrings(string str1, string str2)
{
    return string.Compare(str1, str2, StringComparison.Ordinal) >= 0;
}

var query = from s in db.Strings
            where CompareStrings(s.string1, s.string2)
            select s;

var query = from s in db.Strings
            where SqlMethods.Like(s.string1, s.string2 + "%")
            select s;