17 Questions
What should be added to the table to meet the specified requirements?
[ManagerEmployeeKey] [int] NULL
Which SQL statement should be used to alter the table in Azure Synapse Analytics dedicated SQL pool?
ALTER TABLE [TableName] ADD [ManagerEmployeeKey] [int] NULL
What is the purpose of altering the table in Azure Synapse Analytics dedicated SQL pool as per the given requirements?
To enable users to identify the current manager of employees and support creating an employee reporting hierarchy
What is the benefit of adding a new column to the table according to the provided explanation?
Enable fast lookup of the managers' attributes such as name and job title
Which type of data should be used for the new column according to the provided explanation?
int
What is the main focus of the given Transact-SQL statement?
Altering a table in Azure Synapse Analytics dedicated SQL pool
What will be returned by the query SELECT EmployeeID FROM mytestdb.dbo.myParquetTable WHERE EmployeeName = 'Alice'?
an error
What is the purpose of creating an empty table named SalesFact_work with the same schema as SalesFact in the stored procedure?
To speed up the process of removing old data from SalesFact
What is the benefit of using partition switching in the sequence of actions in the stored procedure for removing old data from SalesFact?
It ensures that only one partition is affected at a time
What happens when you create an external table named ExtTable in Azure Synapse Analytics with LOCATION='/topfolder/' and query it using serverless SQL?
The query will return all files and folders within '/topfolder/'
What can cause an error when inserting a row into mytestdb.myParquetTable in Azure Synapse Analytics Spark pool?
Missing schema definition for myParquetTable
What is the significance of partitioning SalesFact by month in Azure Synapse Analytics?
It facilitates efficient data removal based on time range
What is the role of a clustered columnstore index in the context of the SalesFact table in Azure Synapse Analytics?
To compress data and improve query performance
What could be a potential issue when querying an external table with LOCATION='/topfolder/' using serverless SQL?
'/topfolder/' does not exist in Azure Data Lake Storage Gen2
What is required to ensure successful partition switching between SalesFact and SalesFact_work in Azure Synapse Analytics?
'SalesFact' being empty before switching partitions
What is a potential consequence of not maintaining partition alignment and matching table definitions during partition switching?
Data loss in 'SalesFact' table
What could be a possible cause of the error message related to spark_catalog in Azure Synapse Analytics Spark pool?
Incorrect use of single-part namespace in the query
Study Notes
Altering Tables in Azure Synapse Analytics
- To meet specified requirements, a new column should be added to the table.
- The SQL statement
ALTER TABLEshould be used to alter the table in Azure Synapse Analytics dedicated SQL pool. - The purpose of altering the table is to add a new column to store specific data.
Benefits of Adding a New Column
- The benefit of adding a new column is to store specific data, and it should be of a specific data type according to the provided explanation.
Query and Table Operations
- The query
SELECT EmployeeID FROM mytestdb.dbo.myParquetTable WHERE EmployeeName = 'Alice'will return the EmployeeID of 'Alice'. - Creating an empty table named SalesFact_work with the same schema as SalesFact in a stored procedure is used for partition switching to remove old data from SalesFact.
External Tables and Partitioning
- Creating an external table named ExtTable in Azure Synapse Analytics with LOCATION='/topfolder/' allows querying data from that location using serverless SQL.
- Partitioning SalesFact by month in Azure Synapse Analytics enables efficient data management and querying.
Clustered Columnstore Index
- A clustered columnstore index on the SalesFact table in Azure Synapse Analytics enables efficient querying and data compression.
Partition Switching and Errors
- Partition switching is used to remove old data from SalesFact, and ensuring successful partition switching requires maintained partition alignment and matching table definitions.
- A potential issue when querying an external table using serverless SQL is that the file system may not be accessible.
- A potential consequence of not maintaining partition alignment and matching table definitions is data inconsistencies.
- A possible cause of the error message related to spark_catalog in Azure Synapse Analytics Spark pool is a configuration issue.
Prepare for the Microsoft (DP-203) Data Engineering on Microsoft Azure certification exam with this quiz containing 353 questions. Test your knowledge and get ready to succeed in your first attempt. Access the quiz material at CertyIQ website.
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