Merge remote-tracking branch 'refs/remotes/origin/main'

Practical/Assignment-B2/Queries-B2.md

@@ -28,16 +28,19 @@ db.Employee.aggregate([
 ```mongodb
 db.Employee.aggregate([
   {
-        $match: { Designation: "Developer" }
+    $match: {
+      Designation: "Developer"
+    }
   },
   {
     $group: {
-            _id: { $arrayElemAt: ["$Address.PAddr", 0] },
-            TotalSalary: { $sum: "$Salary" }
+      _id: "$Address.PAddr",
+      Total: { $sum: "$Salary" }
     }
   }
 ])
 
+
 ```
 
 3. Find Total Salary of Employee with Designation "Tester" for Each Company: