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WGU Data Management – Foundations Exam Sample Questions (Q10-Q15):

NEW QUESTION # 10
Which SELECT statement uses valid syntax for SQL?

A. SELECT column1, column2 FROM table_name;
B. SELECT "column name", "column name" FROM "table name" WHERE "column name"
C. SELECT ALL column1, column2 FROM table_name;
D. SELECT column1, column2 WHERE condition FROM table_name;

Answer: A

Explanation:
Avalid SELECT statementin SQL follows this basic syntax:
sql
SELECT column1, column2
FROM table_name
WHERE condition;
The correct optionDfollows this syntaxcorrectly.
Why Other Options Are Incorrect:
* Option A (Incorrect):SQL does not usedouble quotes(") around column/table names unless explicitly required in some databases.
* Option B (Incorrect):The WHERE clausemust appear after the FROM clause.
* Option C (Incorrect):ALL isnota valid keyword in standard SQL queries.
Thus,Option Dfollows the correct SQL syntax.

NEW QUESTION # 11
How is the primary key indicated in a table?

A. By using a formula in SQL
B. By using an SQL keyword
C. By using a diamond symbol inserted into the table
D. By using bold typeface in the appropriate column

Answer: B

Explanation:
In SQL, aprimary key is explicitly defined using the PRIMARY KEY keywordwhen creating a table.
Example Usage:
sql
CREATE TABLE Products (
ProductID INT PRIMARY KEY,
Name VARCHAR(100),
Price DECIMAL(10,2)
);
* Here,PRIMARY KEY is the SQL keyword that designates ProductID as the primary key.
Why Other Options Are Incorrect:
* Option A (Formula in SQL) (Incorrect):SQLdoes not use formulas to define primary keys.
* Option C (Bold typeface) (Incorrect):SQL syntax does not rely on text formatting.
* Option D (Diamond symbol) (Incorrect):ER diagramsmight use symbols, but SQLdoes not use diamonds to indicate keys.
Thus, the correct answer isSQL keyword, as primary keys are explicitly defined using PRIMARY KEY.

NEW QUESTION # 12
Which clause from a SELECT statement immediately accompanies the SELECT clause in MySQL?

A. VALUE
B. WHERE
C. FROM
D. TABLE

Answer: C

Explanation:
InSQL syntax, the FROM clause is the first clause that follows SELECT. It specifies the table(s) from which the data will be retrieved.
Example:
sql
SELECT name, salary FROM Employees;
* Option A (Correct):The FROM clauseimmediately followsthe SELECT clause in MySQL.
* Option B (Incorrect):VALUE is not a valid clause in MySQL SELECT statements.
* Option C (Incorrect):WHERE is used to filter recordsafter specifying the table in FROM.
* Option D (Incorrect):TABLE is not a valid clause following SELECT in SQL.

NEW QUESTION # 13
What is the role of the database administrator?

A. The database administrator develops computer programs that utilize a database.
B. The database administrator is a consumer of data in a database.
C. The database administrator is responsible for securing the database system against unauthorized users.
D. The database administrator determines the format of each data element and the overall database structure.

Answer: C

Explanation:
ADatabase Administrator (DBA)is responsible for the management, security, and performance of a database system. This includes controlling access to data, ensuring database integrity, optimizing performance, managing backups, and protecting the system from unauthorized access.
* Option A (Incorrect):A DBA is not just a consumer of data but is primarily responsible for the database's management.
* Option B (Correct):Security is one of the key responsibilities of a DBA, including enforcing user access controls and implementing encryption and authentication mechanisms.
* Option C (Incorrect):While DBAs work with data structures, it is typically the role of adata architect ordatabase designerto define data formats and schema structures.
* Option D (Incorrect):Developing application programs that interact with the database is typically the role ofsoftware developersordatabase programmers, not DBAs.

NEW QUESTION # 14
Which keyword combines INSERTS, UPDATES, and DELETES operations into a single statement?

A. INTO
B. MERGE
C. DROP
D. JOIN

Answer: B

Explanation:
TheMERGEstatement, also known asUPSERT, combinesINSERT, UPDATE, and DELETEoperations into asingle statementbased on a given condition. It is commonly used indata warehouses and large-scale databases.
Example Usage:
sql
MERGE INTO Employees AS Target
USING NewEmployees AS Source
ON Target.ID = Source.ID
WHEN MATCHED THEN
UPDATE SET Target.Salary = Source.Salary
WHEN NOT MATCHED THEN
INSERT (ID, Name, Salary) VALUES (Source.ID, Source.Name, Source.Salary);
* If a match is found, the UPDATE clause modifies the existing record.
* If no match is found, the INSERT clause adds a new record.
Why Other Options Are Incorrect:
* Option A (INTO) (Incorrect):Used in INSERT INTO, butdoes not combine operations.
* Option B (JOIN) (Incorrect):Used to combine rows from multiple tables, butnot for merging data.
* Option D (DROP) (Incorrect):Deletes database objects liketables, views, and indexes, butdoes not merge data.
Thus, the correct answer isMERGE, as itcombines inserts, updates, and deletes into a single operation.

NEW QUESTION # 15
......

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Data-Management-Foundations Reliable Real Test - Data-Management-Foundations Pass Rate

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WGU Data Management – Foundations Exam Sample Questions (Q10-Q15):

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