public override SqlProvider FormatSum(LambdaExpression sumExpression) { var selectSql = ResolveExpression.ResolveSum(sumExpression); var fromTableSql = FormatTableName(); string noneSql = ""; var joinSql = ResolveExpression.ResolveJoinSql(JoinList, ref noneSql, Context.Set.SelectExpression); var whereSql = ResolveExpression.ResolveWhereList(Context.Set, Params); SqlString = $"{selectSql} {fromTableSql}{joinSql} {whereSql} "; return(this); }