Question

在我的SQL查询中

SELECT unit_price,price_counter FROM products

它在表格中显示结果。该表的最后一列命名为＆＃34;价格和计数器的百分比＆＃34;。 PHP中该列的公式如下：

$PercentCompare = round((float)(($UnitPrice-$PriceCounter)/$UnitPrice) * 100);

现在客户端要求根据最后一列对表进行排序。如果该列也是我products表中的字段或列，我可以轻松地执行ORDER BY，但该列仅在使用上述公式后显示在网页表上。

问题是，如果该列是计算/公式的结果，我如何排序或使用ORDER BY？我正在使用准备好的声明。我这样做：

SELECT unit_price,price_counter FROM products ORDER BY round((float)((unit_price-price_counter)/unit_price) * 100)？

编辑第二次尝试：

$InsertCalculation = ", round((float)((unit_price - price_counter)/unit_price) * 100) AS percentagecounter";
$QueryOrderBy = "perc_list_count";
$MyQuery = "SELECT itemid, address, city, state, zipcode, county, nameofowner, unit_price, price_counter, status" . $InsertCalculation . " FROM products WHERE itemid LIKE ? AND address LIKE ? AND city LIKE ? AND state LIKE ? AND zipcode LIKE ? AND county LIKE ? ORDER BY " . $QueryOrderBy . " ASC";

Answer 1

您可以计算然后按顺序排序。像这样的东西

SELECT unit_price,price_counter,
  ROUND(((unit_price-price_counter)/unit_price) * 100) as percentage_price
FROM products
ORDER BY percentage_price ASC

您可以在此处计算percentage_price，然后按

进行排序

PHP Mysql复杂的Order By

1 个答案: