diff --git a/.gitignore b/.gitignore
index a2628dd..cc39ada 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,4 +4,5 @@ vendor/
 var/cache/*
 !var/log/.gitkeep
 var/log/*
-.env
\ No newline at end of file
+.env
+.vscode
\ No newline at end of file
diff --git a/src/Model.php b/src/Model.php
index c50f95f..7cabadf 100644
--- a/src/Model.php
+++ b/src/Model.php
@@ -64,16 +64,18 @@ class Model
                 $ret = true;
             }
         } else {
-            if (count($this->updated) > 0) {
-                $data = [];
-                $data[$this->pk] = $this->values[$this->pk];
-                foreach ($this->updated as $updatecol) {
-                    $data[$updatecol] = $this->values[$updatecol];
-                }
-                $query = $qb->getPreparedQuery($data, false);
-                $ret = $this->db->updateQuery($query);
-                if ($ret) {
-                    $this->updated = [];
+            if (isset($this->values[$this->pk])) {
+                if (count($this->updated) > 0) {
+                    $data = [];
+                    $data[$this->pk] = $this->values[$this->pk];
+                    foreach ($this->updated as $updatecol) {
+                        $data[$updatecol] = $this->values[$updatecol];
+                    }
+                    $query = $qb->getPreparedQuery($data, false);
+                    $ret = $this->db->updateQuery($query);
+                    if ($ret) {
+                        $this->updated = [];
+                    }
                 }
             }
         }
diff --git a/src/QueryBuilder.php b/src/QueryBuilder.php
index 349ac6d..b9747b7 100644
--- a/src/QueryBuilder.php
+++ b/src/QueryBuilder.php
@@ -8,6 +8,7 @@ class QueryBuilder
     protected array $columns;
     protected array $wheres;
     protected array $orders;
+    protected array $groupby;
     protected string $table;
     protected string $pk;
     protected ?int $take;
@@ -27,6 +28,7 @@ class QueryBuilder
         $this->columns = [];
         $this->wheres = [];
         $this->orders = [];
+        $this->groupby = [];
         $this->offset = null;
         $this->take = null;
         $this->raw_query = "";
@@ -73,6 +75,17 @@ class QueryBuilder
         return $this;
     }
 
+    public function groupBy($columns)
+    {
+        if (is_array($columns)) {
+            $this->groupby = array_merge($this->groupby, $columns);
+        }
+        if (is_string($columns)) {
+            $this->groupby[] = $columns;
+        }
+        return $this;
+    }
+
     public function where($condition, $operator, $value = null)
     {
         if ($value === null) {
@@ -164,14 +177,41 @@ class QueryBuilder
         }
 
         $columns = implode(",", $this->columns);
+        $query = "SELECT " . $columns . " FROM " . $this->table ;
+
+        $where = $this->getWhere();
+        $this->fillData($ret);
+
+        if ($where != "") {
+            $query .= " WHERE " . $where;
+        }
+
+        $query .= $this->getClause("GROUP By", $this->groupby);
+        $query .= $this->getClause("ORDER By", $this->orders);
+        $query .= $this->getLimit();
+
+        $ret->setQuery($query);
+        return $ret;
+    }
+
+    private function fillData(Query &$query): void
+    {
+        foreach ($this->wheres as $expression) {
+            if ($expression instanceof Expression) {
+                $query->addData($expression->getValue());
+            }
+        }
+    }
+
+    private function getWhere(): string
+    {
         $where = "";
         foreach ($this->wheres as $expression) {
             $sw = "";
             if ($expression instanceof Expression) {
                 $sw = $expression->raw();
-                $ret->addData($expression->getValue());
             }
-            if ($expression instanceof string) {
+            if (is_string($expression)) {
                 if (trim($expression) !== "") {
                     $sw = "(" . $expression  . ")";
                 }
@@ -181,25 +221,23 @@ class QueryBuilder
             }
             $where .= $sw;
         }
+        return $where;
+    }
 
-        $query = "SELECT " . $columns . " FROM " . $this->table ;
-        if ($where != "") {
-            $query .= " WHERE " . $where;
-        }
-        if (count($this->orders) > 0) {
-            $query .= " ORDER BY ";
-            $iOrder = 0;
-            foreach ($this->orders as $order) {
-                if ($iOrder > 0) {
-                    $query .= ",";
+    private function getClause(string $word, array $data): string
+    {
+        $ret = "";
+        if (count($data) > 0) {
+            $ret = " $word ";
+            $iClause = 0;
+            foreach ($data as $clause) {
+                if ($iClause > 0) {
+                    $ret .= ",";
                 }
-                $query .= $order;
-                $iOrder++;
+                $ret .= $clause;
+                $iClause++;
             }
         }
-        $query .= $this->getLimit();
-
-        $ret->setQuery($query);
         return $ret;
     }
 
diff --git a/tests/DbTest.php b/tests/DbTest.php
index fa26128..aaf9827 100644
--- a/tests/DbTest.php
+++ b/tests/DbTest.php
@@ -18,8 +18,15 @@ test("insert row",function () {
     $row->col1 = "test";
     $row->date1 = new \DateTime();
     $ret = $row->save();
+
+    $row2 = new Model();
+    $row2->setTable("test");
+    $row2->col1 = "test2";
+    $row2->date1 = new \DateTime();
+    $ret2 = $row2->save();
     
     expect($ret)->toBe(true);
+    expect($ret2)->toBe(true);
 });
 
 test("querybuilder", function() {
@@ -37,7 +44,7 @@ test("querybuilder", function() {
     expect(count($rows))->toBe(1);
 
     $qb->reset();
-    $rows = $qb->where("id",">",1)->columns("*")->get();
+    $rows = $qb->where("id",">",2)->columns("*")->get();
 
     expect($rows)->toBeArray();
     expect(count($rows))->toBe(0);
@@ -53,18 +60,41 @@ test("querybuilder", function() {
     expect(count($rows))->toBe(1);
 });
 
+test("order by", function(){
+    $qb = new QueryBuilder("test");
+    $rows = $qb->orderBy("id","DESC")->get();
+
+    expect($rows)->toBeArray();
+    expect(count($rows))->toBe(2);
+
+    expect($rows[0]->col1)->toBe("test2");
+});
+
+test("group by", function(){
+    $qb = new QueryBuilder("test");
+    $rows = $qb->columns("COUNT(*) as Nb")->get();
+
+    expect($rows)->toBeArray();
+    expect(count($rows))->toBe(1);
+    expect($rows[0]->Nb)->toBe(2);
+
+    $qb->reset();
+    $rows = $qb->columns("COUNT(*) as Nb")->groupBy("id")->get();
+    expect($rows)->toBeArray();
+    expect(count($rows))->toBe(2);
+    expect($rows[0]->Nb)->toBe(1);
+});
+
 test("update row", function() {
     $qb = new QueryBuilder("test","id");
     $row = $qb->find(1);
-
-    $row->col1 = "test2";
+    $row->col1 = "testupdate";
     $res = $row->save();
-
     expect($res)->toBe(true);
 
     $qb->reset();
     $rows = $qb->where("id",1)->columns("*")->get();
     expect($rows)->toBeArray();
     expect(count($rows))->toBe(1);
-    expect($rows[0]->col1)->toBe("test2");
+    expect($rows[0]->col1)->toBe("testupdate");
 });