查询中php公式的“排序结果”

Question

I have the following query and I would like to sort the results of the math formula "echo "" . ((-$row["startweight"] + $row["currweight"])/$row["startweight"]) . " ";" which creates a percentage answer. As there are many people in the result, I'd like to be able to sort the result of the formula in descending order highest to lowest. I've spent a considerable amount of time researching this and I get the feeling it needs to be in some sort of array. I hope not. Here is the entire query for context purposes:

$sql = "SELECT * FROM members";
$result = $conn->query($sql);
echo "<table border=1>
   <tr>
       <th>ID</th>
       <th>Name</th>
       <th>Start Weight</th>
       <th>Current Weight</th>
       <th>Weight Diff</th>
       <th>Percent Diff</th>
       <th>Goal Weight</th>
       <th>Lbs2Go</th>
   <tr>";


if ($result->num_rows > 0) {
    // output data of each row
    while($row = $result->fetch_assoc()) {
    echo "<tr>";
        echo "<td>" . $row["id"] . " </td>";
        echo "<td>" . $row["name"] . " </td>";
        echo "<td>" . $row["startweight"] . " </td>";
        echo "<td>" . $row["currweight"] . " </td>";
        echo "<td>" . ($row["startweight"] - $row["currweight"]) . " </td>";
        echo "<td>" . ((-$row["startweight"] + $row["currweight"])/$row["startweight"]) . " </td>";
        echo "<td>" . $row["goalweight"] . " </td>";
        echo "<td>" . ($row["currweight"] - $row["goalweight"]) . " </td>";
    echo "</tr>";
     }
    echo "</table>";
  } else {
  echo "0 results";
}

Thanks for your help. (and yes... I'm an FNG to programming)

Answer 1

you can sort in SQL:

$sql = "SELECT * FROM members order by (currweight-startweight)/startweight desc";

consider what you will get if startweight is 0

Answer 2

将查询重写为：

select * FROM members order by (currweight-startweight)/startweight