[英]Count rows in a SQL group
我有一个要放在仪表板上的脚本。 SQL会在一段时间内对项目进行分组并将其正确显示在仪表板中。 但是我也想显示数量。
因此,如果SQL进行分组,我该如何计算它返回的行,以便可以将QTY回显到每一行的表中。 这是我的代码。
<?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "dbname";
$custid = $row['CustomerID'];
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql1 = "SELECT * FROM stock
JOIN hardware ON stock.HardwareID = hardware.HardwareID
WHERE stock.CustomerID = $custid GROUP BY stock.HardwareID";
$result1 = $conn->query($sql1);
if ($result1->num_rows > 0) {
// output data of each row
while($row1 = $result1->fetch_assoc()) {
echo "<tr>";
echo "<td>".$row1['Hardware']."</td>";
echo "<td></td>";
echo "</tr>";
}
}
?>
所以目的是要排
echo "<td></td>";
其中包含一个变量,该变量显示分组的每一行的数量。
您可以使用此查询,按查询分组必须选择并提供汇总,这里我提供了计数,如果您需要一些适当的列,则可以相应地更改它...
<?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "dbname";
$custid = $row['CustomerID'];
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql1 = "SELECT stock.Hardwareid, count(*) as CountHardware FROM stock
JOIN hardware ON stock.HardwareID = hardware.HardwareID
WHERE stock.CustomerID = $custid GROUP BY stock.HardwareID";
$result1 = $conn->query($sql1);
if ($result1->num_rows > 0) {
// output data of each row
while($row1 = $result1->fetch_assoc()) {
echo "<tr>";
echo "<td>".$row1['Hardware']."</td>";
echo "<td></td>";
echo "</tr>";
}
}
?>
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