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[英]Subtract sum of two columns of two unrelated tables in mysql database in php
[英]Calculate Pecent Value from Sum of Two Columns in MySQL Database
我试图从两列中获取总值(我已经这样做了)——并获取这些值并从中创建一个百分比。 在这种情况下,我有一个加权值和一个总值。 我需要知道我的加权值占总价值的百分比是多少。
我试过了:
$result = mysqli_query($mysqli, "SELECT SUM(WEIGHTEDV / VALUE) FROM test.service");
$result = mysqli_query($mysqli, "SELECT WEIGHTEDV, VALUE, (WEIGHTEDV / VALUE) AS percent FROM test.service;
$result = mysqli_query($mysqli,"SELECT (WEIGHTEDV / VALUE)*10 AS Percent
FROM test.service");
还有一些我不太记得的其他尝试。
下面是更完整的代码:
VALUE 的登录和工作总和
<?php
//LOGIN INFO
$db_host = 'localhost';
$db_user = 'root';
$db_pw = "********";
$database = "test";
//LOGIN VARIABLE
$mysqli = new mysqli($db_host, $db_user, $db_pw);
//VERIFY LOGIN INTEGRITY
if ($mysqli === false) {
die("Cannot connect to Database Server" . $mysqli->connect_error);
}
if (!mysqli_select_db($mysqli, $database)) {
die("Cannot select test Database" . $mysqli->connect_error);
}
$result = mysqli_query($mysqli, "SELECT SUM(VALUE) FROM test.service");
//PRINT ROWS
$fields_num = mysqli_num_fields($result);
while($row = mysqli_fetch_row($result)) {
foreach($row as $cell) {
echo "$$cell";
}
}
?>
WEIGHTEDV 的工作总和
<?php
$result = mysqli_query($mysqli, "SELECT SUM(WEIGHTEDV) FROM test.service");
//PRINT ROWS
$fields_num = mysqli_num_fields($result);
while($row = mysqli_fetch_row($result)) {
foreach($row as $cell) {
echo "$$cell";
}
}
?>
我的表中当前总数的预期输出是
Expected Output: %54.8
测试变量:
VALUE: 38940.00
WEIGHTEDV:21345.00
两者都有一种类型(我将类型更改为 INT - 结果相同):
DECIMAL(12,2)
实际输出示例(直接从 HTML 表中输出):
65.000000100.0000000.00000050.00000025.000000100.00000050.000000
具有上述输出的当前代码:
$result = mysqli_query($mysqli,"SELECT (WEIGHTEDV / VALUE)*100 AS Percent
FROM test.service");
这让我难以置信。 我相信这是我忽略的简单事情。 关于为什么我无法获得简单的 % 值输出的任何帮助将不胜感激。
似乎您需要数字格式和适当的<br />
while($row = mysqli_fetch_row($result)) {
foreach($row as $cell) {
echo umber_format($cell, 2, '.', ',')."<br>";
}
}
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