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MySQL的聚合函數(shù)在PHP統(tǒng)計(jì)分析中的應(yīng)用非常廣泛。聚合函數(shù)是一種特殊類型的函數(shù),可以對(duì)一組值執(zhí)行計(jì)算并返回單個(gè)值。在PHP中,我們通常使用MySQLi或PDO擴(kuò)展來與MySQL數(shù)據(jù)庫進(jìn)行交互。以下是幾個(gè)常用的MySQL聚合函數(shù)及其在PHP統(tǒng)計(jì)分析中的應(yīng)用:
$sql = "SELECT COUNT(*) FROM users";
$result = mysqli_query($connection, $sql);
$row = mysqli_fetch_assoc($result);
echo "用戶數(shù)量:" . $row['COUNT(*)'];
$sql = "SELECT SUM(price) as total_price FROM orders";
$result = mysqli_query($connection, $sql);
$row = mysqli_fetch_assoc($result);
echo "訂單總價(jià):" . $row['total_price'];
$sql = "SELECT AVG(age) as average_age FROM users";
$result = mysqli_query($connection, $sql);
$row = mysqli_fetch_assoc($result);
echo "用戶平均年齡:" . $row['average_age'];
$sql = "SELECT MIN(price) as min_price FROM orders";
$result = mysqli_query($connection, $sql);
$row = mysqli_fetch_assoc($result);
echo "訂單最低價(jià):" . $row['min_price'];
$sql = "SELECT MAX(price) as max_price FROM orders";
$result = mysqli_query($connection, $sql);
$row = mysqli_fetch_assoc($result);
echo "訂單最高價(jià):" . $row['max_price'];
通過使用這些MySQL聚合函數(shù),我們可以在PHP中輕松地實(shí)現(xiàn)數(shù)據(jù)統(tǒng)計(jì)和分析功能。
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