php日期比较问题,我尝试了很多日期,但根本无法使用

问题描述 投票:-2回答:1

我的代码如下工作正常

$sql = "SELECT Type, dt, SUM(Amount) AS Total FROM Expense GROUP BY Type";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
    echo "<table><tr><th>Type</th><th>Amount</th></tr>";
    // output data of each row
    while($row = $result->fetch_assoc()) {
        echo "</td><td>".$row["Type"]."</td><td>". round($row[Total],2)."</td></tr>";
    }
} else {
    echo "0 results";
}

enter image description here

但我在其中添加了“ 2020-01-23”和“ 2020-03-01”之间的位置,如下所示,结果为0。请帮助解决此问题。

<?php

$sql = "SELECT Type, dt, SUM(Amount) AS Total FROM Expense GROUP BY Type  WHERE dt BETWEEN '2020-01-23' AND '2020-03-01' ";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    echo "<table><tr><th>Type</th><th>Amount</th></tr>";
    // output data of each row
    while($row = $result->fetch_assoc()) {
        echo "</td><td>".$row["Type"]."</td><td>". round($row[Total], 2)."</td></tr>";
    }


} else {
    echo "0 results";
}
php date
1个回答
1
投票

您的group by子句在错误的位置,请参见下文,它必须遵循where子句

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