[05/Indigirka/03]
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Questions and Answers

Which type of SQL queries can be used to customize the appearance and behavior of a specific column?

  • Subqueries
  • Aggregate Functions
  • Virtual Calculated Columns (correct)
  • Nested Queries

    • What is an example of customizing the appearance and behavior of a specific column in SQL?

  • CAST(recovery_rate) as float (correct)
  • SUM(sales) as total_sales
  • SELECT * FROM table_name
  • ORDER BY column_name

    • Which type of functions are not allowed in calculated columns in SQL?

  • Date Functions
  • Mathematical Functions
  • Aggregate Functions (correct)
  • String Functions

    • Aggregate functions can be used in calculated columns in SQL.

    <p>False (B)</p> Signup and view all the answers

    Calculated columns in SQL can change the appearance and behavior of a specific column.

    <p>True (A)</p> Signup and view all the answers

    Customizing the appearance and behavior of a specific column in SQL can be achieved through aggregate functions.

    <p>False (B)</p> Signup and view all the answers

    Match the following SQL functions with their usage in creating virtual calculated columns:

    <p>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</p> Signup and view all the answers

    Match the following SQL clauses with their role in creating virtual calculated columns:

    <p>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</p> Signup and view all the answers

    Match the following SQL statement types with their usage in creating virtual calculated columns:

    <p>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</p> Signup and view all the answers

    What are virtual calculated columns in Flow.BI used for?

    <p>Creating new columns in a dataset that are not present in the underlying data source (A)</p> Signup and view all the answers

    Where can virtual calculated columns be created in Flow.BI?

    <p>In the Explore page (A)</p> Signup and view all the answers

    What is the first step to create a virtual calculated column in Flow.BI?

    <p>Click the Columns tab (C)</p> Signup and view all the answers

    What should be done before using virtual calculated columns in production according to the tips provided?

    <p>Document the virtual calculated columns (B)</p> Signup and view all the answers

    What is a recommended practice for naming virtual calculated columns?

    <p>Give clear and concise names (B)</p> Signup and view all the answers

    Which page in Flow.BI should be accessed to enter the SQL expression for a virtual calculated column?

    <p>Create Column dialog box (D)</p> Signup and view all the answers

    What type of function should be used to define virtual calculated columns?

    <p>Descriptive SQL expressions (D)</p> Signup and view all the answers

    2

    <p>Use vague and ambiguous names for the columns. (B)</p> Signup and view all the answers

    What is recommended when creating virtual calculated columns?

    <p>Use descriptive SQL expressions. (B)</p> Signup and view all the answers

    What is the first step to create a virtual calculated column in Flow.BI?

    <p>Click the Columns tab. (B)</p> Signup and view all the answers

    What should be done before using virtual calculated columns in production according to the tips provided?

    <p>Test your virtual calculated columns thoroughly before using them in production. (B)</p> Signup and view all the answers

    Virtual calculated columns in Flow.BI are created using SQL expressions.

    <p>True (A)</p> Signup and view all the answers

    Virtual calculated columns can only be used to combine existing columns in new ways.

    <p>False (B)</p> Signup and view all the answers

    To create a virtual calculated column, click the Rows tab and then click the Create button.

    <p>False (B)</p> Signup and view all the answers

    You should test your virtual calculated columns thoroughly before using them in production, according to the tips provided.

    <p>True (A)</p> Signup and view all the answers

    Aggregate functions can be used in virtual calculated columns in Flow.BI.

    <p>True (A)</p> Signup and view all the answers

    Descriptive SQL expressions should not be used to define virtual calculated columns.

    <p>False (B)</p> Signup and view all the answers

    Virtual calculated columns cannot be used in charts, dashboards, and reports in Flow.BI.

    <p>False (B)</p> Signup and view all the answers

    Virtual calculated columns in Flow.BI are not a recommended tool for exploring and visualizing data.

    <p>False (B)</p> Signup and view all the answers

    You should give your virtual calculated columns clear and concise names, according to the tips provided.

    <p>True (A)</p> Signup and view all the answers

    Virtual calculated columns can only be created in the Flow.BI Explore page.

    <p>False (B)</p> Signup and view all the answers

    To define a virtual calculated column, enter a name and description in the Create Column dialog box, but do not enter an SQL expression.

    <p>False (B)</p> Signup and view all the answers

    Documenting your virtual calculated columns is not a recommended practice according to the tips provided.

    <p>False (B)</p> Signup and view all the answers

    Match the following with their role in creating virtual calculated columns in Flow.BI:

    <p>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</p> Signup and view all the answers

    Match the following with their usage in using virtual calculated columns in Flow.BI:

    <p>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</p> Signup and view all the answers

    Match the following with their recommendations for using virtual calculated columns in Flow.BI:

    <p>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</p> Signup and view all the answers

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