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Download DemoVendor: Microsoft
Certifications: Microsoft Certified: Azure Data Engineer Associate
Exam Code: DP-203
Exam Name: Data Engineering on Microsoft Azure
Updated: Nov 27, 2024
Q&As: 398
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HOTSPOT
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:
Correct 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
You are designing an Azure Databricks interactive cluster. The cluster will be used infrequently and will be configured for auto-termination. You need to use that the cluster configuration is retained indefinitely after the cluster is terminated. The solution must minimize costs. What should you do?
A. Pin the cluster.
B. Create an Azure runbook that starts the cluster every 90 days.
C. Terminate the cluster manually when processing completes.
D. Clone the cluster after it is terminated.
Correct Answer: A
Azure Databricks retains cluster configuration information for up to 70 all-purpose clusters terminated in the last 30 days and up to 30 job clusters recently terminated by the job scheduler. To keep an all-purpose cluster configuration even after it has been terminated for more than 30 days, an administrator can pin a cluster to the cluster list.
Reference: https://docs.microsoft.com/en-us/azure/databricks/clusters/
You are designing a fact table named FactPurchase in an Azure Synapse Analytics dedicated SQL pool. The table contains purchases from suppliers for a retail store. FactPurchase will contain the following columns.
FactPurchase will have 1 million rows of data added daily and will contain three years of data. Transact-SQL queries similar to the following query will be executed daily.
SELECT
SupplierKey, StockItemKey, IsOrderFinalized, COUNT(*)FROM FactPurchase WHERE DateKey >= 20210101
AND DateKey <= 20210131GROUP By SupplierKey, StockItemKey, IsOrderFinalized
Which table distribution will minimize query times?
A. replicated
B. hash-distributed on PurchaseKey
C. round-robin
D. hash-distributed on IsOrderFinalized
Correct Answer: B
Hash-distributed tables improve query performance on large fact tables. To balance the parallel processing, select a distribution column that:
1.
Has many unique values. The column can have duplicate values. All rows with the same value are assigned to the same distribution. Since there are 60 distributions, some distributions can have > 1 unique values while others may end with zero values.
2.
Does not have NULLs, or has only a few NULLs.
3.
Is not a date column. Incorrect Answers:
C: Round-robin tables are useful for improving loading speed.
Reference: https://docs.microsoft.com/en-us/azure/synapse-analytics/sql-data-warehouse/sql-data-warehouse-tables-distribute
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