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Comptia DA0-001（Comptia Data+認定）認定試験は、データ管理のスキルと知識を実証したいIT専門家にとって不可欠な認定です。この認定は世界中で認識されており、ベンダー中立であり、幅広いテクノロジーやプラットフォームで作業したいIT専門家にとって魅力的な認証となっています。 CompTIA Data+ Certification Exam 認定 DA0-001 試験問題 (Q161-Q166):質問 # 161
A data analyst is asked on the morning of April 9, 2020, to create a sales report that identifies sales year to date. The daily sales data is current through the end of the day. Which of the following date ranges should be on the report?
A. January 1, 2020 to April 8, 2020
B. January 1, 2020 to April 1, 2020
C. January 1, 2020 to April 7, 2020
D. January 1, 2020 to April 9, 2020
正解：D
質問 # 162
Given the following customer and order tables:
Which of the following describes the number of rows and columns of data that would be present after performing an INNER JOIN of the tables?
A. Nine rows, five columns
B. Eight rows, seven columns
C. Seven rows, eight columns
D. Five rows, eight columns
正解：C
解説：
Explanation
This is because an INNER JOIN is a type of join that combines two tables based on a matching condition and returns only the rows that satisfy the condition. An INNER JOIN can be used to merge data from different tables that have a common column or a key, such as customer ID or order ID. To perform an INNER JOIN of the customer and order tables, we can use the following SQL statement:
This statement will select all the columns (*) from both tables and join them on the customer ID column, which is the common column between them. The result of this statement will be a new table that has seven rows and eight columns, as shown below:
The reason why there are seven rows and eight columns in the result table is because:
There are seven rows because there are six customers and six orders in the original tables, but only five customers have matching orders based on the customer ID column. Therefore, only five rows will have data from both tables, while one row will have data only from the customer table (customer 5), and one row will have no data at all (null values).
There are eight columns because there are four columns in each of the original tables, and all of them are selected and joined in the result table. Therefore, the result table will have four columns from the customer table (customer ID, first name, last name, and email) and four columns from the order table (order ID, order date, product, and quantity).
質問 # 163
A data analyst has been asked to create one table that has each employee's first name, last name, sales, and address. The sales and addresses are listed in the tables below:
Which of the following steps should the analyst take to create the table?
A. Transpose the first name and last name in both tables. Use lookup to pull the address field from Table 2 into Table 1.
B. Use the append formula in both tables for the first name and last name. Use lookup to pull the address field from Table 2 into Table 1.
C. Create a column that concatenates the first name and last name in each table. Use concatenate and lookup to bring the address field into Table 1.
D. Use lookup with the first name or first name to pull the address field from Table 2 into Table 1.
正解：C
質問 # 164
Which of the following is an example of a at flat file?
A. JSON file
B. PDF file
C. CSV file
D. JPEG file
正解：D
質問 # 165
Which of the following are reasons to conduct data cleansing? (Select two).
A. To calculate trends
B. To track KPls
C. To increase the sample size
D. To perform web scraping
E. To review data sets
F. To improve accuracy
正解：A、F
解説：
Two reasons to conduct data cleansing are:
* To improve accuracy: Data cleansing helps to ensure that the data is correct, consistent, and reliable.
This can improve the quality and validity of the analysis, as well as the decision-making and outcomes based on the data12
* To calculate trends: Data cleansing helps to remove or resolve any errors, outliers, or missing values that could distort or skew the data. This can help to identify and measure the patterns, changes, or relationships in the data over time13
