在PHP中使用Oracle数据库进行多维数据分析和优化技巧

<?php
// 连接到Oracle数据库
$conn = oci_connect('username', 'password', 'localhost/XE');

if (!$conn) {
    $e = oci_error();
    trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
}

// 执行SQL查询
$stid = oci_parse($conn, 'SELECT * FROM employees');
oci_execute($stid);
?>

<?php
// 查询多维数据
$stid = oci_parse($conn, 'SELECT department, job, AVG(salary) AS avg_salary FROM employees GROUP BY CUBE (department, job)');
oci_execute($stid);

while ($row = oci_fetch_array($stid, OCI_ASSOC)) {
    echo 'Department: ' . $row['DEPARTMENT'] . ', Job: ' . $row['JOB'] . ', Average Salary: ' . $row['AVG_SALARY'] . '<br/>';
}
?>

<?php
// 多维分析
$stid = oci_parse($conn, 'SELECT department, job, SUM(salary) AS total_salary FROM employees GROUP BY department, job WITH ROLLUP');
oci_execute($stid);

while ($row = oci_fetch_array($stid, OCI_ASSOC)) {
    echo 'Department: ' . $row['DEPARTMENT'] . ', Job: ' . $row['JOB'] . ', Total Salary: ' . $row['TOTAL_SALARY'] . '<br/>';
}
?>

<?php
// 查询员工销售数据
$stid = oci_parse($conn, 'SELECT department, job, SUM(sales) AS total_sales FROM sales GROUP BY department, job');
oci_execute($stid);

echo '<table>';
    echo '<tr><th>Department</th><th>Job</th><th>Total Sales</th></tr>';

while ($row = oci_fetch_array($stid, OCI_ASSOC)) {
    echo '<tr><td>' . $row['DEPARTMENT'] . '</td><td>' . $row['JOB'] . '</td><td>' . $row['TOTAL_SALES'] . '</td></tr>';
}

echo '</table>';
?>