diff --git a/drivers/elastic.py b/drivers/elastic.py
index b9863d2..055e55b 100644
--- a/drivers/elastic.py
+++ b/drivers/elastic.py
@@ -112,4 +112,54 @@ class Elastic_Testing(DB_Testing):
                 }
             }
         }
-        return f"Got {driver.search(index=INDEX, body=query).body['aggregations']['attachment_count']['value']}"
\ No newline at end of file
+        return f"Got {driver.search(index=INDEX, body=query).body['aggregations']['attachment_count']['value']}"
+    
+    def update_add_replies_per_last_name(self, driver: Elasticsearch) -> str:
+        agg_query = {
+            "size": 0,
+            "aggs": {
+                "reply_count_by_last_name": {
+                "terms": {
+                    "script": {
+                    "source": "String name = doc['sender_name.keyword'].value; String[] parts = /\\s+/.split(name); return parts[parts.length - 1]",
+                    "lang": "painless"
+                    },
+                    "size": 1000
+                },
+                "aggs": {
+                    "total_reply_count": {
+                    "sum": {
+                        "field": "reply_count"
+                    }
+                    }
+                }
+                }
+            }
+        }
+        
+        agg_results = driver.search(index=INDEX, body=agg_query)
+        
+        buckets = agg_results['aggregations']['reply_count_by_last_name']['buckets']
+        reply_counts = {bucket['key']: bucket['total_reply_count']['value'] for bucket in buckets}
+        
+        update_query = {
+            "script": {
+                "source": """
+                String name = ctx._source.sender_name;
+                String[] parts = /\\s+/.split(name);
+                String lastName = parts[parts.length - 1];
+                if (params.replyCounts.containsKey(lastName)) {
+                    ctx._source.total_reply_count = params.replyCounts.get(lastName);
+                }
+                """,
+                "lang": "painless",
+                "params": {
+                "replyCounts": reply_counts
+                }
+            },
+            "query": {
+                "match_all": {}
+            }
+        }
+        
+        driver.update_by_query(index=INDEX, body=update_query, conflicts="proceed")
\ No newline at end of file
diff --git a/drivers/psql.py b/drivers/psql.py
index 30e9b78..0ffe969 100644
--- a/drivers/psql.py
+++ b/drivers/psql.py
@@ -29,6 +29,8 @@ class PSQL_Thread(Data_Thread):
 class PSQL_Testing(DB_Testing):
     driver_name = "PSQL"
     
+    
+    
     def __init__(self) -> None:
         super().__init__()
         self.data = [PSQL_Thread(x) for x in Threads]
@@ -109,4 +111,29 @@ class PSQL_Testing(DB_Testing):
         cursor.execute(searchQuery)
         driver.commit()
         return f"Got {cursor.fetchone()[0]}"
-            
\ No newline at end of file
+            
+    def update_add_replies_per_last_name(self, driver: connection) -> str:
+        cursor = driver.cursor()
+        alterQuery = """
+        ALTER TABLE thread ADD COLUMN last_name_replies INT;
+        """
+        updateQuery = """
+        WITH last_name_sums AS (
+            SELECT 
+                recipient_name,
+                SUM(reply_count) OVER (PARTITION BY SPLIT_PART(recipient_name, ' ', -1)) AS total_replies
+            FROM 
+                thread
+        )
+        UPDATE thread AS t
+        SET last_name_replies = ln_sums.total_replies
+        FROM last_name_sums AS ln_sums
+        WHERE t.recipient_name = ln_sums.recipient_name;
+        """
+        unalterQuery = """
+        ALTER TABLE thread DROP COLUMN last_name_replies;
+        """ 
+        cursor.execute(alterQuery)
+        cursor.execute(updateQuery)
+        cursor.execute(unalterQuery)
+        driver.commit()
\ No newline at end of file
diff --git a/interfaces/db_testing_interface.py b/interfaces/db_testing_interface.py
index 17a1b12..02019c6 100644
--- a/interfaces/db_testing_interface.py
+++ b/interfaces/db_testing_interface.py
@@ -5,7 +5,7 @@ from utils.utils import time_func
 from time import sleep
 
 T = TypeVar('T')
-NUM_RUNS = 10000
+NUM_RUNS = 10
 
 class DB_Testing(Generic[T]):
     driver_name: str
@@ -50,6 +50,10 @@ class DB_Testing(Generic[T]):
     def get_sum_attachment_less_5(self, driver: T) -> str:
         pass
     
+    @abstractmethod
+    def update_add_replies_per_last_name(self, driver: T) -> str:
+        pass
+    
     
     def do_tests(self, driver: T) -> Dict[str, float]:
         stats = {}
@@ -63,9 +67,15 @@ class DB_Testing(Generic[T]):
         sleep(1) # To wait for any indexing to avoid race conditions somehow
         
         # Multiple
+        
+        # Search
         stats.update(time_func(f"[{self.driver_name}] Count mails with more than 5 attachments and Mr/Mrs", "attach5_mr_mrs", lambda : self.attach5_mr_mrs(driver), NUM_RUNS))
         stats.update(time_func(f"[{self.driver_name}] Sum the number of attachment from mail that have less than 5 attachments", "get_sum_attachment_less_5", lambda : self.get_sum_attachment_less_5(driver), NUM_RUNS))
         stats.update(time_func(f"[{self.driver_name}] Count mails that have a lorem sentence", "search_lorem", lambda : self.search_lorem(driver), NUM_RUNS))
         stats.update(time_func(f"[{self.driver_name}] Count mails that have a mail that ends with microsoft.com", "search_mails_ends_microsoftcom", lambda : self.search_mails_ends_microsoftcom(driver), NUM_RUNS))
+        
+        # Update
+        stats.update(time_func(f"[{self.driver_name}] Update all thread to add a field with the total replies per last name", "update_add_replies_per_last_name", lambda : self.update_add_replies_per_last_name(driver), NUM_RUNS))
+
         print("\n")
         return stats
\ No newline at end of file
diff --git a/plot.png b/plot.png
new file mode 100644
index 0000000..481814e
Binary files /dev/null and b/plot.png differ