small changes

Author: chirag127

dbms/3t.md

@@ -2,8 +2,6 @@
 <h1> Experiment 3</h1>
 </center>
 
-# Tables
-
 ## Table 1: sales_master schema
 
 | Columnname  | Datatype | Size | Attributes                                   |

dbms/4t.md

@@ -18,6 +18,7 @@
 | Column name | Data type | Size | Attributes |
 |-------------|-----------|------|------------|
 | challan_no | varchar | 6 | Primary key/Foreign key references Product_no of product_master |
+| product_no | varchar | 6 | Primary key/Foreign key references Product_no of product_master |
 | qty_disp | number | 4,2 | not null |
 
 ## Table 3: Challan_Header table data