TDA-C01資格問題集 & TDA-C01練習問題集
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Tableau Certified Data Analyst 認定 TDA-C01 試験問題 (Q160-Q165):
質問 # 160
You connect to a database server by using Tableau Prep. The database server has a data role named Role1.
You have the following field in the data.
You need to apply the Role1 data role to the Material field.
Which two actions should you perform? Choose two.
- A. From the More actions menu of Materials, filter the selected values.
- B. For the data type of the Material field, select Custom, and then select Role1.
- C. From the More actions menu of Materials, select Group Values, and then select Spelling.
- D. From the More actions menu of Materials, select Valid in the Show values section.
正解：B、C
解説：
To apply a custom data role to a field, you need to select the data type of the field and then choose the data role from the list of available roles. This will validate the values in the field against the data role and mark any invalid values with a red exclamation mark. To fix the invalid values, you can use the Group Values option and select the Spelling algorithm, which will group values that are close in spelling and replace them with the most frequent value in the group. This will help you standardize the values in the Material field and match them with the Role1 data role. Reference: The information is based on the following sources:
Use Data Roles to Validate your Data - Tableau
New in Tableau Prep: Automatically identify data quality issues with Data Roles
質問 # 161
You company has two divisions located in the United States and Germany Bach division has a separate database. The following is a sample of the sales data for the division in the United States.
The following is a sample of the sales data for me division in Germany.
You have population data in a file named Populatio.csv. the following is a sample of the data.
You plan to create a visualization that ml show tie sales per capita for each salesperson Each salesperson must be identified by identified by their full name.
You need to prepare the data to support the planned visualization. The data source must support being published .
Which four actions should you perform in order?
(Place the four correct options n order Use the arrows to move Options to Answer Area arrows to re-order the options.
Use Answer Area arrows to re-order the options)
正解：
解説：
Explanation:
1) Open Tableau prep
2) Create a new column ...
3) Union the sales ...
4) Join the sales ...
References: https://help.tableau.com/current/prep/en-us/prep_get_started.htm https://help.tableau.com/current
/prep/en-us/prep_union.htm https://help.tableau.com/current/prep/en-us/prep_clean.htm https://help.tableau.
com/current/prep/en-us/prep_join.htm
質問 # 162
You have the following map.
You need the map to appear as shown in the following visualization.
What should you do?
- A. Change the mark type to Density
- B. Change the opacity to 75%
- C. Drag Population to Size on the Marks card
- D. Drag Location to Size on the Marks card
- E. Change the mark type to Map
正解：C
質問 # 163
You want to create the following dashboard that will contain two sheets.
What should you do?
- A. Drag both sheets to the dashboard and add a background lo each sheet.
- B. Add a border to both sheets and add both sheets to a horizontal object.
- C. Drag both sheets to the dashboard and add a border to each sheet.
- D. Add both sheets lo a horizontal container and add a border to the container.
正解：D
質問 # 164
You have the following worksheet.
You want to create a table calculation that shows sales growth over each year.
How should you complete the formula? (Use the dropdowns in the Answer Area to select the correct options to complete the formula.)
正解：
解説：
Explanation:
There are different ways to create a table calculation that shows sales growth over each year, but one possible answer is:
SUM([Sales])
LOOKUP(SUM([Sales]), -1)
PREVIOUS_VALUE(0)
To calculate the sales growth over each year, you need to compare the current year's sales with the previous year's sales and divide the difference by the previous year's sales. You can use the SUM, LOOKUP, and PREVIOUS_VALUE functions to achieve this. The SUM function returns the total sales for each year. The LOOKUP function returns the value of an expression in a target row, specified as a relative offset from the current row. The PREVIOUS_VALUE function returns the value of the expression in the previous row, or a specified value if there is no previous row. The formula for the table calculation is:
(SUM([Sales]) - LOOKUP(SUM([Sales]), -1)) / PREVIOUS_VALUE(0)
This formula subtracts the sales of the previous year (LOOKUP(SUM([Sales]), -1)) from the sales of the current year (SUM([Sales])) and divides the result by the sales of the previous year. If there is no previous year, the formula uses 0 as the denominator (PREVIOUS_VALUE(0)) to avoid division by zero errors.
References:
Tableau Certified Data Analyst Exam Prep Guide, page 11, section "Creating Calculated Fields" Tableau Help: SUM Function Tableau Help: LOOKUP Function Tableau Help: PREVIOUS_VALUE Function
質問 # 165
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