Exam DP-203 topic 2 question 10 discussion

DRAG DROP -
You have an Apache Spark DataFrame named temperatures. A sample of the data is shown in the following table.

You need to produce the following table by using a Spark SQL query.

How should you complete the query? To answer, drag the appropriate values to the correct targets. Each value may be used once, more than once, or not at all.
You may need to drag the split bar between panes or scroll to view content.
NOTE: Each correct selection is worth one point.
Select and Place:

Suggested Answer:
Box 1: PIVOT -
PIVOT rotates a table-valued expression by turning the unique values from one column in the expression into multiple columns in the output. And PIVOT runs aggregations where they're required on any remaining column values that are wanted in the final output.
Incorrect Answers:
UNPIVOT carries out the opposite operation to PIVOT by rotating columns of a table-valued expression into column values.

Box 2: CAST -
If you want to convert an integer value to a DECIMAL data type in SQL Server use the CAST() function.
Example:

SELECT -
CAST(12 AS DECIMAL(7,2) ) AS decimal_value;
Here is the result:
decimal_value
12.00
Reference:
https://learnsql.com/cookbook/how-to-convert-an-integer-to-a-decimal-in-sql-server/ https://docs.microsoft.com/en-us/sql/t-sql/queries/from-using-pivot-and-unpivot