SQL Query for generating matrix like output querying related table in SQL Server

Question

I have three tables:
Product

ProductID   ProductName  
1           Cycle  
2           Scooter  
3           Car  

<

Answer 1

We can create matrix using pivot, this can easily done with data frames

product|Key|Value
A      |P  |10|
A      |Q  |40|
B      |R  |50|
B      |S  |50|

val newdf=df.groupBy("product").pivot("key").sum("value")

|product|P   |Q   |R   |S   |
|B      |null|null|  50|  50|
|A      |  10|  40|null|null|

We can replace null and we can do calculations as well