Made the Check in function

db.json

@@ -1 +1 @@
-{"_default": {"1": {"Serial Number": "1", "Brand": "3", "Grade": "8", "Name": "9"}}}
+{"_default": {"1": {"Serial Number": "1", "Brand": "3", "Grade": "", "Name": ""}}}

main.py

@@ -134,7 +134,6 @@ def main():
             G = window["Grade"].get()
             N = window["Name"].get()
             Table = window["table"].get()
-            print(Table)
             for row in Table:
                 if SN == row[0]:
                     row[2] = G
@@ -143,7 +142,19 @@ def main():
             query=Query()
             db.update({"Grade": G, "Name": N}, query["Serial Number"] == SN)
  
-
+        elif event == "Check In":
+            SN = window["Serial Number"].get()
+            Table = window["table"].get()
+            for row in Table:
+                if SN == row[0]:
+                    row[2] = ""
+                    row[3] = ""
+            window["table"].update(Table)
+            window["Grade"].update("")
+            window["Name"].update("")
+            query=Query()
+            db.update({"Grade": "", "Name": ""}, query["Serial Number"] == SN)
+  
     # Finish up by removing from the screen
     window.close()