public SqlProvider <T> FormatSum(LambdaExpression lambdaExpression)
{
var selectSql = ResolveExpression.ResolveSum(typeof(T).GetProperties(), lambdaExpression);
var fromTableSql = FormatTableName();
var whereParams = ResolveExpression.ResolveWhere(Context.QuerySet.WhereExpression);
var whereSql = whereParams.SqlCmd;
Params = whereParams.Param;
SqlString = $"{selectSql} {fromTableSql} {whereSql} ";
return(this);
}