diff --git a/admin/statistics.php b/admin/statistics.php
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+<?php
+/**
+ * admin/statistics.php
+ *
+ * Statistiques par pays, operateur, technologie et bande. Page en
+ * lecture seule : aucune ecriture, aucune action sensible. Uniquement
+ * des agregations SQL via requetes preparees.
+ *
+ * CORRIGE (20/09/2026, suite a erreur 500 en usage reel) : cette page
+ * utilisait des noms de colonnes inexistants dans le schema reel
+ * (o.name, c.technology), ecrits avant que le schema definitif
+ * (install_full_schema.sql) ne soit connu. Alignee maintenant sur les
+ * vraies colonnes :
+ *   - operators.brand (pas "name")
+ *   - cells.tech       (pas "technology")
+ * Ajout egalement du require_once _nav.php qui manquait, provoquant
+ * une erreur fatale "Call to undefined function render_admin_nav()".
+ */
+declare(strict_types=1);
+
+require_once __DIR__ . '/admin_auth.php';
+require_once __DIR__ . '/../lib/db.php';
+require_once __DIR__ . '/_nav.php';
+
+require_admin_auth();
+
+$db = pdo();
+
+$countries = $db->query('SELECT id, name FROM countries ORDER BY name')->fetchAll(PDO::FETCH_ASSOC);
+$countryId = filter_input(INPUT_GET, 'country_id', FILTER_VALIDATE_INT) ?: null;
+
+$whereCountry = '';
+$params = [];
+if ($countryId) {
+    $whereCountry = 'WHERE s.country_id = ?';
+    $params[] = $countryId;
+}
+
+$totalSites = 0;
+$totalCells = 0;
+try {
+    $stmt = $db->prepare("SELECT COUNT(*) FROM sites s $whereCountry");
+    $stmt->execute($params);
+    $totalSites = (int)$stmt->fetchColumn();
+
+    $stmt = $db->prepare(
+        "SELECT COUNT(*) FROM cells c INNER JOIN sites s ON s.id = c.site_id $whereCountry"
+    );
+    $stmt->execute($params);
+    $totalCells = (int)$stmt->fetchColumn();
+} catch (Throwable $e) {
+    error_log('[statistics] compteurs generaux: ' . $e->getMessage());
+}
+
+$byOperator = $db->prepare(
+    "SELECT o.brand AS operator_name, COUNT(DISTINCT s.id) AS site_count, COUNT(c.id) AS cell_count
+     FROM operators o
+     LEFT JOIN sites s ON s.operator_id = o.id " . ($countryId ? 'AND s.country_id = ?' : '') . "
+     LEFT JOIN cells c ON c.site_id = s.id
+     GROUP BY o.id, o.brand
+     ORDER BY cell_count DESC"
+);
+$byOperator->execute($countryId ? [$countryId] : []);
+$byOperator = $byOperator->fetchAll(PDO::FETCH_ASSOC);
+
+$byTechnology = $db->prepare(
+    "SELECT c.tech, COUNT(*) AS total
+     FROM cells c
+     INNER JOIN sites s ON s.id = c.site_id
+     $whereCountry
+     GROUP BY c.tech
+     ORDER BY total DESC"
+);
+$byTechnology->execute($params);
+$byTechnology = $byTechnology->fetchAll(PDO::FETCH_ASSOC);
+
+$byBand = $db->prepare(
+    "SELECT c.band, COUNT(*) AS total
+     FROM cells c
+     INNER JOIN sites s ON s.id = c.site_id
+     $whereCountry
+     GROUP BY c.band
+     ORDER BY total DESC
+     LIMIT 30"
+);
+$byBand->execute($params);
+$byBand = $byBand->fetchAll(PDO::FETCH_ASSOC);
+
+$user = current_admin_username();
+?>
+<!DOCTYPE html>
+<html lang="fr">
+<head>
+    <meta charset="UTF-8">
+    <title>Statistiques — NetMonster Admin</title>
+    <link rel="stylesheet" href="assets/theme.css">
+</head>
+<body>
+<?php render_admin_nav('statistics.php', $user); ?>
+
+<main class="page-wrap">
+    <h1>Statistiques</h1>
+    <p class="page-subtitle">Vue de consultation agregee, sans action d'ecriture possible.</p>
+
+    <section class="card">
+        <form method="get" class="filters">
+            <label>Pays
+                <select name="country_id" onchange="this.form.submit()">
+                    <option value="">Tous les pays</option>
+                    <?php foreach ($countries as $c): ?>
+                        <option value="<?= (int)$c['id'] ?>" <?= $countryId === (int)$c['id'] ? 'selected' : '' ?>>
+                            <?= htmlspecialchars((string)$c['name'], ENT_QUOTES, 'UTF-8') ?>
+                        </option>
+                    <?php endforeach; ?>
+                </select>
+            </label>
+        </form>
+    </section>
+
+    <section class="card">
+        <h2>Vue d'ensemble</h2>
+        <div class="stats-bar">
+            <div class="stat-chip"><strong><?= number_format($totalSites, 0, ',', ' ') ?></strong>Sites</div>
+            <div class="stat-chip"><strong><?= number_format($totalCells, 0, ',', ' ') ?></strong>Cellules</div>
+        </div>
+    </section>
+
+    <section class="card">
+        <h2>Par operateur</h2>
+        <table class="data-table">
+            <tr><th>Operateur</th><th>Sites</th><th>Cellules</th></tr>
+            <?php foreach ($byOperator as $row): ?>
+                <tr>
+                    <td><?= htmlspecialchars((string)$row['operator_name'], ENT_QUOTES, 'UTF-8') ?></td>
+                    <td><?= (int)$row['site_count'] ?></td>
+                    <td><?= (int)$row['cell_count'] ?></td>
+                </tr>
+            <?php endforeach; ?>
+            <?php if (empty($byOperator)): ?>
+                <tr><td colspan="3" class="no-cadastre">Aucune donnee.</td></tr>
+            <?php endif; ?>
+        </table>
+    </section>
+
+    <section class="card">
+        <h2>Par technologie</h2>
+        <table class="data-table">
+            <tr><th>Technologie</th><th>Cellules</th></tr>
+            <?php foreach ($byTechnology as $row): ?>
+                <tr>
+                    <td><?= htmlspecialchars((string)$row['tech'], ENT_QUOTES, 'UTF-8') ?></td>
+                    <td><?= (int)$row['total'] ?></td>
+                </tr>
+            <?php endforeach; ?>
+            <?php if (empty($byTechnology)): ?>
+                <tr><td colspan="2" class="no-cadastre">Aucune donnee.</td></tr>
+            <?php endif; ?>
+        </table>
+    </section>
+
+    <section class="card">
+        <h2>Par bande (top 30)</h2>
+        <table class="data-table">
+            <tr><th>Bande</th><th>Cellules</th></tr>
+            <?php foreach ($byBand as $row): ?>
+                <tr>
+                    <td><?= htmlspecialchars((string)$row['band'], ENT_QUOTES, 'UTF-8') ?></td>
+                    <td><?= (int)$row['total'] ?></td>
+                </tr>
+            <?php endforeach; ?>
+            <?php if (empty($byBand)): ?>
+                <tr><td colspan="2" class="no-cadastre">Aucune donnee.</td></tr>
+            <?php endif; ?>
+        </table>
+    </section>
+</main>
+</body>
+</html>
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