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index 0000000..c78e7c9
Binary files /dev/null and b/data/ha-nam.xls differ
diff --git a/data/ha-noi.xls b/data/ha-noi.xls
new file mode 100644
index 0000000..d8ca43d
Binary files /dev/null and b/data/ha-noi.xls differ
diff --git a/data/ha-tinh.xls b/data/ha-tinh.xls
new file mode 100644
index 0000000..8bebed5
Binary files /dev/null and b/data/ha-tinh.xls differ
diff --git a/data/hai-duong.xls b/data/hai-duong.xls
new file mode 100644
index 0000000..95bdf51
Binary files /dev/null and b/data/hai-duong.xls differ
diff --git a/data/hai-phong.xls b/data/hai-phong.xls
new file mode 100644
index 0000000..6fd2fc3
Binary files /dev/null and b/data/hai-phong.xls differ
diff --git a/data/hau-giang.xls b/data/hau-giang.xls
new file mode 100644
index 0000000..4e69fa1
Binary files /dev/null and b/data/hau-giang.xls differ
diff --git a/data/ho-chi-minh.xls b/data/ho-chi-minh.xls
new file mode 100644
index 0000000..9994477
Binary files /dev/null and b/data/ho-chi-minh.xls differ
diff --git a/data/hoa-binh.xls b/data/hoa-binh.xls
new file mode 100644
index 0000000..c034aec
Binary files /dev/null and b/data/hoa-binh.xls differ
diff --git a/data/hung-yen.xls b/data/hung-yen.xls
new file mode 100644
index 0000000..d5fe12f
Binary files /dev/null and b/data/hung-yen.xls differ
diff --git a/data/khanh-hoa.xls b/data/khanh-hoa.xls
new file mode 100644
index 0000000..69c11b7
Binary files /dev/null and b/data/khanh-hoa.xls differ
diff --git a/data/kien-giang.xls b/data/kien-giang.xls
new file mode 100644
index 0000000..f9ff88d
Binary files /dev/null and b/data/kien-giang.xls differ
diff --git a/data/kon-tum.xls b/data/kon-tum.xls
new file mode 100644
index 0000000..781f5c8
Binary files /dev/null and b/data/kon-tum.xls differ
diff --git a/data/lai-chau.xls b/data/lai-chau.xls
new file mode 100644
index 0000000..c54cafe
Binary files /dev/null and b/data/lai-chau.xls differ
diff --git a/data/lam-dong.xls b/data/lam-dong.xls
new file mode 100644
index 0000000..83d5183
Binary files /dev/null and b/data/lam-dong.xls differ
diff --git a/data/lang-son.xls b/data/lang-son.xls
new file mode 100644
index 0000000..09a6e67
Binary files /dev/null and b/data/lang-son.xls differ
diff --git a/data/lao-cai.xls b/data/lao-cai.xls
new file mode 100644
index 0000000..0a140ab
Binary files /dev/null and b/data/lao-cai.xls differ
diff --git a/data/long-an.xls b/data/long-an.xls
new file mode 100644
index 0000000..0521d03
Binary files /dev/null and b/data/long-an.xls differ
diff --git a/data/nam-dinh.xls b/data/nam-dinh.xls
new file mode 100644
index 0000000..2341bbc
Binary files /dev/null and b/data/nam-dinh.xls differ
diff --git a/data/nghe-an.xls b/data/nghe-an.xls
new file mode 100644
index 0000000..a861b4d
Binary files /dev/null and b/data/nghe-an.xls differ
diff --git a/data/ninh-binh.xls b/data/ninh-binh.xls
new file mode 100644
index 0000000..0527547
Binary files /dev/null and b/data/ninh-binh.xls differ
diff --git a/data/ninh-thuan.xls b/data/ninh-thuan.xls
new file mode 100644
index 0000000..0055b6a
Binary files /dev/null and b/data/ninh-thuan.xls differ
diff --git a/data/phu-tho.xls b/data/phu-tho.xls
new file mode 100644
index 0000000..cd09b6c
Binary files /dev/null and b/data/phu-tho.xls differ
diff --git a/data/phu-yen.xls b/data/phu-yen.xls
new file mode 100644
index 0000000..77ad508
Binary files /dev/null and b/data/phu-yen.xls differ
diff --git a/data/quang-binh.xls b/data/quang-binh.xls
new file mode 100644
index 0000000..9ead57f
Binary files /dev/null and b/data/quang-binh.xls differ
diff --git a/data/quang-nam.xls b/data/quang-nam.xls
new file mode 100644
index 0000000..a98711f
Binary files /dev/null and b/data/quang-nam.xls differ
diff --git a/data/quang-ngai.xls b/data/quang-ngai.xls
new file mode 100644
index 0000000..b3caaa8
Binary files /dev/null and b/data/quang-ngai.xls differ
diff --git a/data/quang-ninh.xls b/data/quang-ninh.xls
new file mode 100644
index 0000000..420eccf
Binary files /dev/null and b/data/quang-ninh.xls differ
diff --git a/data/quang-tri.xls b/data/quang-tri.xls
new file mode 100644
index 0000000..f6a5533
Binary files /dev/null and b/data/quang-tri.xls differ
diff --git a/data/soc-trang.xls b/data/soc-trang.xls
new file mode 100644
index 0000000..1b28fc7
Binary files /dev/null and b/data/soc-trang.xls differ
diff --git a/data/son-la.xls b/data/son-la.xls
new file mode 100644
index 0000000..93c6962
Binary files /dev/null and b/data/son-la.xls differ
diff --git a/data/tay-ninh.xls b/data/tay-ninh.xls
new file mode 100644
index 0000000..1b2f9d5
Binary files /dev/null and b/data/tay-ninh.xls differ
diff --git a/data/thai-binh.xls b/data/thai-binh.xls
new file mode 100644
index 0000000..d073bb8
Binary files /dev/null and b/data/thai-binh.xls differ
diff --git a/data/thai-nguyen.xls b/data/thai-nguyen.xls
new file mode 100644
index 0000000..d7fdf30
Binary files /dev/null and b/data/thai-nguyen.xls differ
diff --git a/data/thanh-hoa.xls b/data/thanh-hoa.xls
new file mode 100644
index 0000000..de89c45
Binary files /dev/null and b/data/thanh-hoa.xls differ
diff --git a/data/thua-thien-hue.xls b/data/thua-thien-hue.xls
new file mode 100644
index 0000000..41c7c4a
Binary files /dev/null and b/data/thua-thien-hue.xls differ
diff --git a/data/tien-giang.xls b/data/tien-giang.xls
new file mode 100644
index 0000000..00b1ebb
Binary files /dev/null and b/data/tien-giang.xls differ
diff --git a/data/tra-vinh.xls b/data/tra-vinh.xls
new file mode 100644
index 0000000..b65eea9
Binary files /dev/null and b/data/tra-vinh.xls differ
diff --git a/data/tuyen-quang.xls b/data/tuyen-quang.xls
new file mode 100644
index 0000000..2e4ed83
Binary files /dev/null and b/data/tuyen-quang.xls differ
diff --git a/data/vinh-long.xls b/data/vinh-long.xls
new file mode 100644
index 0000000..2d5cafe
Binary files /dev/null and b/data/vinh-long.xls differ
diff --git a/data/vinh-phuc.xls b/data/vinh-phuc.xls
new file mode 100644
index 0000000..05b60ed
Binary files /dev/null and b/data/vinh-phuc.xls differ
diff --git a/data/yen-bai.xls b/data/yen-bai.xls
new file mode 100644
index 0000000..5d53f48
Binary files /dev/null and b/data/yen-bai.xls differ
diff --git a/scripts/build-database.js b/scripts/build-database.js
index 70c22b5..0fec9b1 100644
--- a/scripts/build-database.js
+++ b/scripts/build-database.js
@@ -37,14 +37,13 @@ function toAscii(str) {
     .toLowerCase();
 }
 
-// Collect all .xlsx files directly under data/
+// Collect all .xls and .xlsx files directly under data/
 function collectExcelFiles() {
   const files = [];
   for (const f of fs.readdirSync(RAW_DIR)) {
     const full = path.join(RAW_DIR, f);
-    if (fs.statSync(full).isFile() && f.endsWith(".xlsx")) {
-      files.push(full);
-    }
+    if (!fs.statSync(full).isFile()) continue;
+    if (f.endsWith(".xls") || f.endsWith(".xlsx")) files.push(full);
   }
   return files;
 }
@@ -127,22 +126,30 @@ function main() {
 
       try {
         const wb = XLSX.readFile(file);
-        const ws = wb.Sheets[wb.SheetNames[0]];
-        const rows = XLSX.utils.sheet_to_json(ws, { header: 1 });
-
-        for (let i = 0; i < rows.length; i++) {
-          const row = rows[i];
-
-          // Skip header rows
-          if (i === 0 && isHeaderRow(row)) continue;
+        // Iterate ALL sheets — .xls files over 65,536 rows (Hà Nội, HCM) split
+        // into continuation sheets that we must not miss.
+        const allRows = [];
+        for (const sheetName of wb.SheetNames) {
+          const rows = XLSX.utils.sheet_to_json(wb.Sheets[sheetName], {
+            header: 1,
+          });
+          for (let i = 0; i < rows.length; i++) {
+            // Skip header row on every sheet (continuation sheets may repeat it,
+            // or start directly with data — isHeaderRow handles both)
+            if (i === 0 && isHeaderRow(rows[i])) continue;
+            allRows.push(rows[i]);
+          }
+        }
 
+        for (let i = 0; i < allRows.length; i++) {
+          const row = allRows[i];
           try {
-            const hoTen = String(row[0] || "").trim();
-            const ngaySinh = String(row[1] || "").trim();
-            const soBaoDanh = String(row[2] || "").trim();
-            const diemThi = String(row[3] || "");
+            const hoTen = String(row?.[0] || "").trim();
+            const ngaySinh = String(row?.[1] || "").trim();
+            const soBaoDanh = String(row?.[2] || "").trim();
+            const diemThi = String(row?.[3] || "");
 
-            // Validate: soBaoDanh should be numeric-like
+            // Skip truly empty rows (common tail padding in .xls)
             if (!soBaoDanh || !hoTen) continue;
 
             const scores = parseScores(diemThi);
diff --git a/scripts/crawl-baotintuc.js b/scripts/crawl-baotintuc.js
new file mode 100644
index 0000000..7fb8036
--- /dev/null
+++ b/scripts/crawl-baotintuc.js
@@ -0,0 +1,137 @@
+// Crawl Excel score files for all 63 provinces from baotintuc.vn article:
+// https://baotintuc.vn/tuyen-sinh/tra-cuu-diem-thi-thpt-2017-cua-63-tinh-thanh-pho-tren-baotintucvn-20170706073512672.htm
+// Saves to data/<ascii-kebab-name>.xls (63 files). Idempotent: skips already-downloaded files.
+import fs from "fs";
+import path from "path";
+import { fileURLToPath } from "url";
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const OUT_DIR = path.join(__dirname, "..", "data");
+
+const LINKS = [
+  ["An Giang", "https://cdnmedia.baotintuc.vn/2017/07/06/17/57/Angiang.xls"],
+  ["Bac Lieu", "https://cdnmedia.baotintuc.vn/2017/07/06/17/59/Baclieu.xls"],
+  ["Ba Ria - Vung Tau", "https://cdnmedia.baotintuc.vn/2017/07/06/08/17/1BaRiaVungTau.xls"],
+  ["Bac Giang", "https://cdnmedia.baotintuc.vn/2017/07/06/09/33/BacGiang.xls"],
+  ["Bac Kan", "https://cdnmedia.baotintuc.vn/2017/07/06/08/27/BacKan.xls"],
+  ["Bac Ninh", "https://cdnmedia.baotintuc.vn/2017/07/06/09/33/BacNinh.xls"],
+  ["Ben Tre", "https://cdnmedia.baotintuc.vn/2017/07/06/09/34/BenTre.xls"],
+  ["Binh Duong", "https://cdnmedia.baotintuc.vn/2017/07/06/09/34/BinhDuong.xls"],
+  ["Binh Thuan", "https://cdnmedia.baotintuc.vn/2017/07/06/09/35/BinhThuan.xls"],
+  ["Binh Phuoc", "https://cdnmedia.baotintuc.vn/2017/07/06/09/09/BinhPhuoc.xls"],
+  ["Binh Dinh", "https://cdnmedia.baotintuc.vn/2017/07/06/13/05/Binhdinh.xls"],
+  ["Ca Mau", "https://cdnmedia.baotintuc.vn/2017/07/06/13/05/Camau.xls"],
+  ["Cao Bang", "https://cdnmedia.baotintuc.vn/2017/07/06/18/02/Caobang.xls"],
+  ["Can Tho", "https://cdnmedia.baotintuc.vn/2017/07/06/13/07/Cantho.xls"],
+  ["Da Nang", "https://cdnmedia.baotintuc.vn/2017/07/06/18/03/Danang.xls"],
+  ["Dak Nong", "https://cdnmedia.baotintuc.vn/2017/07/06/09/35/DakNong.xls"],
+  ["Dak Lak", "https://cdnmedia.baotintuc.vn/2017/07/06/18/02/Daklak.xls"],
+  ["Dong Nai", "https://cdnmedia.baotintuc.vn/2017/07/06/13/08/dongnai.xls"],
+  ["Dong Thap", "https://cdnmedia.baotintuc.vn/2017/07/06/17/59/Dongthap.xls"],
+  ["Dien Bien", "https://cdnmedia.baotintuc.vn/2017/07/06/09/08/DienBien.xls"],
+  ["Gia Lai", "https://cdnmedia.baotintuc.vn/2017/07/06/13/09/Gia-Lai.xls"],
+  ["Ha Giang", "https://cdnmedia.baotintuc.vn/2017/07/06/18/18/Hagiang.xls"],
+  ["Ha Noi", "https://cdnmedia.baotintuc.vn/2017/07/07/08/16/HaNoi.xls"],
+  ["Ha Nam", "https://cdnmedia.baotintuc.vn/2017/07/06/09/07/Hanam.xls"],
+  ["Ha Tinh", "https://cdnmedia.baotintuc.vn/2017/07/06/09/36/HaTinh.xls"],
+  ["Hai Phong", "https://cdnmedia.baotintuc.vn/2017/07/06/08/18/23HaiPhong.xls"],
+  ["Hai Duong", "https://cdnmedia.baotintuc.vn/2017/07/06/09/36/HaiDuong.xls"],
+  ["Hau Giang", "https://cdnmedia.baotintuc.vn/2017/07/06/18/00/Haugiang.xls"],
+  ["Ho Chi Minh", "https://cdnmedia.baotintuc.vn/2017/07/06/08/26/HCM.xls"],
+  ["Hoa Binh", "https://cdnmedia.baotintuc.vn/2017/07/06/09/06/HoaBinh.xls"],
+  ["Hung Yen", "https://cdnmedia.baotintuc.vn/2017/07/06/08/25/HungYen.xls"],
+  ["Khanh Hoa", "https://cdnmedia.baotintuc.vn/2017/07/06/18/04/Khanhhoa.xls"],
+  ["Kien Giang", "https://cdnmedia.baotintuc.vn/2017/07/06/08/28/KienGiang.xls"],
+  ["Kon Tum", "https://cdnmedia.baotintuc.vn/2017/07/06/18/05/KonTum.xls"],
+  ["Nam Dinh", "https://cdnmedia.baotintuc.vn/2017/07/06/07/55/13NamDinh.xls"],
+  ["Nghe An", "https://cdnmedia.baotintuc.vn/2017/07/06/07/55/14NgheAn.xls"],
+  ["Ninh Binh", "https://cdnmedia.baotintuc.vn/2017/07/06/09/37/NinhBinh.xls"],
+  ["Ninh Thuan", "https://cdnmedia.baotintuc.vn/2017/07/06/18/00/Ninhthuan.xls"],
+  ["Lao Cai", "https://cdnmedia.baotintuc.vn/2017/07/06/08/52/11LaoCai.xls"],
+  ["Lai Chau", "https://cdnmedia.baotintuc.vn/2017/07/06/13/33/LaiChau.xls"],
+  ["Lang Son", "https://cdnmedia.baotintuc.vn/2017/07/06/18/05/Langson.xls"],
+  ["Lam Dong", "https://cdnmedia.baotintuc.vn/2017/07/06/09/00/LamDong.xls"],
+  ["Long An", "https://cdnmedia.baotintuc.vn/2017/07/06/08/53/12LongAn.xls"],
+  ["Quang Binh", "https://cdnmedia.baotintuc.vn/2017/07/06/09/23/QuangBinh.xls"],
+  ["Quang Nam", "https://cdnmedia.baotintuc.vn/2017/07/06/09/24/QuangNam.xls"],
+  ["Quang Ninh", "https://cdnmedia.baotintuc.vn/2017/07/06/18/06/Quangninh.xls"],
+  ["Quang Ngai", "https://cdnmedia.baotintuc.vn/2017/07/06/09/24/QuangNgai.xls"],
+  ["Quang Tri", "https://cdnmedia.baotintuc.vn/2017/07/06/09/25/QuangTri.xls"],
+  ["Phu Tho", "https://cdnmedia.baotintuc.vn/2017/07/06/09/23/PhuTho.xls"],
+  ["Phu Yen", "https://cdnmedia.baotintuc.vn/2017/07/06/09/38/PhuYen.xls"],
+  ["Son La", "https://cdnmedia.baotintuc.vn/2017/07/06/18/01/Sonla.xls"],
+  ["Soc Trang", "https://cdnmedia.baotintuc.vn/2017/07/06/18/06/Soctrang.xls"],
+  ["Tay Ninh", "https://cdnmedia.baotintuc.vn/2017/07/06/09/26/TayNinh.xls"],
+  ["Thai Binh", "https://cdnmedia.baotintuc.vn/2017/07/06/09/09/ThaiBinh.xls"],
+  ["Thai Nguyen", "https://cdnmedia.baotintuc.vn/2017/07/06/13/35/ThaiNguyen.xls"],
+  ["Thanh Hoa", "https://cdnmedia.baotintuc.vn/2017/07/06/13/10/thanhoa.xls"],
+  ["Tra Vinh", "https://cdnmedia.baotintuc.vn/2017/07/06/09/38/TraVinh.xls"],
+  ["Thua Thien Hue", "https://cdnmedia.baotintuc.vn/2017/07/06/13/10/thuathienhue.xls"],
+  ["Tien Giang", "https://cdnmedia.baotintuc.vn/2017/07/06/13/11/tiengiang.xls"],
+  ["Tuyen Quang", "https://cdnmedia.baotintuc.vn/2017/07/06/09/39/TuyenQuang.xls"],
+  ["Vinh Phuc", "https://cdnmedia.baotintuc.vn/2017/07/06/09/40/VinhPhuc.xls"],
+  ["Vinh Long", "https://cdnmedia.baotintuc.vn/2017/07/06/13/13/vinhlong.xls"],
+  ["Yen Bai", "https://cdnmedia.baotintuc.vn/2017/07/06/18/07/Yenbai.xls"],
+];
+
+function slug(name) {
+  return name.toLowerCase().replace(/[^a-z0-9]+/g, "-").replace(/^-|-$/g, "");
+}
+
+async function downloadOne(name, url) {
+  const outPath = path.join(OUT_DIR, `${slug(name)}.xls`);
+  if (fs.existsSync(outPath) && fs.statSync(outPath).size > 0) {
+    return { name, url, outPath, status: "skip", size: fs.statSync(outPath).size };
+  }
+  const res = await fetch(url, {
+    headers: {
+      "User-Agent":
+        "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0 Safari/537.36",
+      Referer:
+        "https://baotintuc.vn/tuyen-sinh/tra-cuu-diem-thi-thpt-2017-cua-63-tinh-thanh-pho-tren-baotintucvn-20170706073512672.htm",
+    },
+  });
+  if (!res.ok) {
+    return { name, url, outPath, status: "fail", httpStatus: res.status };
+  }
+  const buf = Buffer.from(await res.arrayBuffer());
+  fs.writeFileSync(outPath, buf);
+  return { name, url, outPath, status: "ok", size: buf.length };
+}
+
+async function main() {
+  fs.mkdirSync(OUT_DIR, { recursive: true });
+  console.log(`Downloading ${LINKS.length} files to ${OUT_DIR}...`);
+
+  const CONCURRENCY = 6;
+  const results = [];
+  let i = 0;
+  async function worker() {
+    while (i < LINKS.length) {
+      const idx = i++;
+      const [name, url] = LINKS[idx];
+      try {
+        const r = await downloadOne(name, url);
+        results.push(r);
+        const tag = r.status === "ok" ? "✓" : r.status === "skip" ? "·" : "✗";
+        const sz = r.size ? `${(r.size / 1024).toFixed(0)} KB` : "";
+        console.log(`  ${tag} [${idx + 1}/${LINKS.length}] ${name.padEnd(20)} ${sz} ${r.status === "fail" ? "HTTP " + r.httpStatus : ""}`);
+      } catch (err) {
+        console.log(`  ✗ [${idx + 1}/${LINKS.length}] ${name}: ${err.message}`);
+        results.push({ name, url, status: "error", message: err.message });
+      }
+    }
+  }
+  await Promise.all(Array.from({ length: CONCURRENCY }, worker));
+
+  const ok = results.filter((r) => r.status === "ok").length;
+  const skip = results.filter((r) => r.status === "skip").length;
+  const fail = results.filter((r) => r.status === "fail" || r.status === "error");
+  console.log(`\nDone. ok=${ok} skip=${skip} fail=${fail.length}`);
+  if (fail.length) {
+    console.log("Failed:", fail.map((f) => f.name).join(", "));
+    process.exit(1);
+  }
+}
+
+main();
diff --git a/scripts/diff-datasets.js b/scripts/diff-datasets.js
new file mode 100644
index 0000000..6df1d20
--- /dev/null
+++ b/scripts/diff-datasets.js
@@ -0,0 +1,113 @@
+// Compare new DB (public/thptqg2017.db) vs backup old DB (backup/thptqg2017.old.db)
+import Database from "better-sqlite3";
+
+const NEW = new Database("public/thptqg2017.db", { readonly: true });
+const OLD = new Database("backup/thptqg2017.old.db", { readonly: true });
+
+const SCORE_COLS = [
+  "toan", "ngu_van", "vat_ly", "hoa_hoc", "sinh_hoc", "khtn",
+  "lich_su", "dia_ly", "gdcd", "khxh",
+  "tieng_anh", "tieng_phap", "tieng_nga", "tieng_trung",
+];
+
+// Old schema may lack some newer columns — detect and project a subset
+const oldCols = new Set(
+  OLD.prepare("PRAGMA table_info(student)").all().map((c) => c.name),
+);
+const commonCols = SCORE_COLS.filter((c) => oldCols.has(c));
+
+const newCount = NEW.prepare("SELECT COUNT(*) c FROM student").get().c;
+const oldCount = OLD.prepare("SELECT COUNT(*) c FROM student").get().c;
+console.log(`\n=== Row counts ===`);
+console.log(`  new: ${newCount}`);
+console.log(`  old: ${oldCount}`);
+console.log(`  diff: ${newCount - oldCount >= 0 ? "+" : ""}${newCount - oldCount}`);
+
+// Build SBD sets (memory: 861k strings ~50 MB, fine)
+const newSbd = new Set(
+  NEW.prepare("SELECT so_bao_danh FROM student").all().map((r) => r.so_bao_danh),
+);
+const oldSbd = new Set(
+  OLD.prepare("SELECT so_bao_danh FROM student").all().map((r) => r.so_bao_danh),
+);
+
+let newOnly = 0, oldOnly = 0, common = 0;
+for (const s of newSbd) (oldSbd.has(s) ? common++ : newOnly++);
+for (const s of oldSbd) if (!newSbd.has(s)) oldOnly++;
+
+console.log(`\n=== SBD membership ===`);
+console.log(`  new-only (added):     ${newOnly}`);
+console.log(`  old-only (removed):   ${oldOnly}`);
+console.log(`  common:               ${common}`);
+
+// Sample 5 new-only SBDs to peek
+const sampleNewOnly = [];
+for (const s of newSbd) {
+  if (!oldSbd.has(s)) sampleNewOnly.push(s);
+  if (sampleNewOnly.length >= 5) break;
+}
+if (sampleNewOnly.length) {
+  const rows = NEW.prepare(
+    `SELECT so_bao_danh, ho_ten FROM student WHERE so_bao_danh IN (${sampleNewOnly.map(() => "?").join(",")})`,
+  ).all(...sampleNewOnly);
+  console.log(`  sample new-only rows:`);
+  rows.forEach((r) => console.log(`    ${r.so_bao_danh}  ${r.ho_ten}`));
+}
+
+// Score comparison on common SBDs
+console.log(`\n=== Score comparison (common SBDs) ===`);
+console.log(`  columns compared: ${commonCols.join(", ")}`);
+
+const newStmt = NEW.prepare(
+  `SELECT so_bao_danh, ${commonCols.join(",")} FROM student`,
+);
+const oldStmt = OLD.prepare(
+  `SELECT so_bao_danh, ${commonCols.join(",")} FROM student`,
+);
+
+// Build old map
+const oldMap = new Map();
+for (const r of oldStmt.iterate()) oldMap.set(r.so_bao_danh, r);
+
+let identical = 0,
+  differ = 0;
+const colChanges = Object.fromEntries(commonCols.map((c) => [c, { changed: 0, newNull: 0, oldNull: 0 }]));
+const sampleDiffs = [];
+
+for (const nr of newStmt.iterate()) {
+  const or = oldMap.get(nr.so_bao_danh);
+  if (!or) continue;
+  let rowDiffers = false;
+  const rowChanges = [];
+  for (const c of commonCols) {
+    const a = nr[c], b = or[c];
+    if (a === b) continue;
+    // treat very-close floats as equal (xlsx may emit 5.5 vs 5.50)
+    if (a !== null && b !== null && Math.abs(a - b) < 1e-9) continue;
+    rowDiffers = true;
+    colChanges[c].changed++;
+    if (a === null) colChanges[c].newNull++;
+    if (b === null) colChanges[c].oldNull++;
+    rowChanges.push(`${c}: ${b} → ${a}`);
+  }
+  if (rowDiffers) {
+    differ++;
+    if (sampleDiffs.length < 5) sampleDiffs.push({ sbd: nr.so_bao_danh, changes: rowChanges });
+  } else {
+    identical++;
+  }
+}
+
+console.log(`  identical:  ${identical}`);
+console.log(`  differing:  ${differ}`);
+console.log(`  per-column changes:`);
+for (const [c, info] of Object.entries(colChanges)) {
+  if (info.changed === 0) continue;
+  console.log(`    ${c.padEnd(14)} changed=${info.changed}  (new-null=${info.newNull}, old-null=${info.oldNull})`);
+}
+if (sampleDiffs.length) {
+  console.log(`  sample diffs:`);
+  sampleDiffs.forEach((d) => {
+    console.log(`    SBD ${d.sbd}: ${d.changes.slice(0, 4).join("; ")}${d.changes.length > 4 ? " ..." : ""}`);
+  });
+}