modify read-me v0.1

README.md

@@ -122,4 +122,23 @@ The ***TraceDQL*** query is as follows:
 
 ### TraceDQL queries to answer Q2
 
+The second question focuses on determining how many head products were produced during a given period. In this case, we consider the simulation duration as the given period. To calculate this, we first ***select*** all products and then ***filter them based on their type***.
+
+A key challenge here is that the same product may appear multiple times in the execution trace. For example, a head product with id = 1 is captured three times(i.., at currentTime = 2, currentTime = 3, and currentTime = 5). To avoid counting the same product more than once, we can eliminate duplicates by using the product’s ***id*** attribute.
+<div align="center">
+  <img src="images/head_pp_schema.png" alt="Alt text" width="300">
+</div>
+
+Therefore, a ***TraceDQL*** query to count the heads produced products is as follows:
+<div align="center">
+  <img src="images/query_head_pp.png" alt="Alt text" width="300">
+</div>
+The ***type*** parameter is used to generalize the query, allowing it to retrieve products of any specified type.
+In our case, the ***type*** is ***head***, which will be passed as a parameter in the following ***data***:
+<div align="center">
+  <img src="images/data_head_pp.png" alt="Alt text" width="400">
+</div>
+
+### TraceDQL queries to answer Q3
+
 coming soon...
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