35 Questions
Which type of SQL queries can be used to customize the appearance and behavior of a specific column?
Virtual Calculated Columns
What is an example of customizing the appearance and behavior of a specific column in SQL?
CAST(recovery_rate) as float
Which type of functions are not allowed in calculated columns in SQL?
Aggregate Functions
Aggregate functions can be used in calculated columns in SQL.
False
Calculated columns in SQL can change the appearance and behavior of a specific column.
True
Customizing the appearance and behavior of a specific column in SQL can be achieved through aggregate functions.
False
Match the following SQL functions with their usage in creating virtual calculated columns:
CAST(column_name AS data_type) = Changing the data type of a specific column CONCAT(column1, column2) = Concatenating values from two columns DATEADD(interval, number, column_name) = Adding a specific interval to date values in a column UPPER(column_name) = Converting the text in a column to uppercase
Match the following SQL clauses with their role in creating virtual calculated columns:
WHERE = Filtering rows based on a condition CASE = Conditional logic to derive new values for a column GROUP BY = Grouping rows and applying aggregate functions HAVING = Filtering groups based on a condition
Match the following SQL statement types with their usage in creating virtual calculated columns:
SELECT = Retrieving data and computing new columns UPDATE = Modifying existing data including calculated column values INSERT = Adding new rows with computed column values DELETE = Removing rows without affecting calculated columns
What are virtual calculated columns in Flow.BI used for?
Creating new columns in a dataset that are not present in the underlying data source
Where can virtual calculated columns be created in Flow.BI?
In the Explore page
What is the first step to create a virtual calculated column in Flow.BI?
Click the Columns tab
What should be done before using virtual calculated columns in production according to the tips provided?
Document the virtual calculated columns
What is a recommended practice for naming virtual calculated columns?
Give clear and concise names
Which page in Flow.BI should be accessed to enter the SQL expression for a virtual calculated column?
Create Column dialog box
What type of function should be used to define virtual calculated columns?
Descriptive SQL expressions
2
Use vague and ambiguous names for the columns.
What is recommended when creating virtual calculated columns?
Use descriptive SQL expressions.
What is the first step to create a virtual calculated column in Flow.BI?
Click the Columns tab.
What should be done before using virtual calculated columns in production according to the tips provided?
Test your virtual calculated columns thoroughly before using them in production.
Virtual calculated columns in Flow.BI are created using SQL expressions.
True
Virtual calculated columns can only be used to combine existing columns in new ways.
False
To create a virtual calculated column, click the Rows tab and then click the Create button.
False
You should test your virtual calculated columns thoroughly before using them in production, according to the tips provided.
True
Aggregate functions can be used in virtual calculated columns in Flow.BI.
True
Descriptive SQL expressions should not be used to define virtual calculated columns.
False
Virtual calculated columns cannot be used in charts, dashboards, and reports in Flow.BI.
False
Virtual calculated columns in Flow.BI are not a recommended tool for exploring and visualizing data.
False
You should give your virtual calculated columns clear and concise names, according to the tips provided.
True
Virtual calculated columns can only be created in the Flow.BI Explore page.
False
To define a virtual calculated column, enter a name and description in the Create Column dialog box, but do not enter an SQL expression.
False
Documenting your virtual calculated columns is not a recommended practice according to the tips provided.
False
Match the following with their role in creating virtual calculated columns in Flow.BI:
Click the Create button = Initiates the creation of a virtual calculated column Enter the SQL expression = Defines the logic for the virtual calculated column Click the Columns tab = Accesses the area for creating virtual calculated columns Give clear and concise names = Recommended practice for naming virtual calculated columns
Match the following with their usage in using virtual calculated columns in Flow.BI:
Charts, dashboards, and reports = Where virtual calculated columns can be used Testing thoroughly = Recommended before using virtual calculated columns in production Combining existing columns = One of the purposes of virtual calculated columns Extending capabilities of Flow.BI = One of the benefits of using virtual calculated columns
Match the following with their recommendations for using virtual calculated columns in Flow.BI:
Descriptive SQL expressions = Recommended for defining virtual calculated columns Documenting = Recommended practice for virtual calculated columns Clear and concise names = Recommended for naming virtual calculated columns Testing thoroughly = Recommended before using virtual calculated columns in production
Test your SQL skills by writing queries to customize the appearance and behavior of specific columns using virtual calculated columns. Practice using functions like CAST and other techniques to manipulate column data.
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