public override SqlProvider FormatSum(LambdaExpression sumExpression)
        {
            var selectSql = ResolveExpression.ResolveSum(sumExpression);

            var fromTableSql = FormatTableName();

            var whereSql = ResolveExpression.ResolveWhereList();

            string noneSql = "";
            var    joinSql = ResolveExpression.ResolveJoinSql(JoinList, ref noneSql);

            SqlString = $"{selectSql} {fromTableSql}{joinSql} {whereSql} ";

            return(this);
        }