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Exam Data-Management-Foundations Tips & Reliable Data-Management-Foundations Exam Pdf
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WGU Data Management – Foundations Exam Sample Questions (Q20-Q25):
NEW QUESTION # 20
What is the role of the transaction manager within the database system architecture?
- A. The transaction manager translates the query processor instructions into filesystem commands and uses an index to quickly locate the requested data.
- B. The transaction manager logs insert, update, and delete queries, and the result is sent back to the application.
- C. The transaction manager is composed of a query processor, storage manager, transaction manager, log, and catalog.
- D. The transaction manager uses information from the catalog to perform query optimization.
Answer: B
NEW QUESTION # 21
Which phase of entity-relationship modeling refers to the maxima and minima of relationships and attributes?
- A. Physical design
- B. Partition
- C. Attribute minimum
- D. Cardinality
Answer: D
Explanation:
Cardinalitydefines theminimum and maximum number of occurrencesof one entity in relation to another.
Example Usage in an ER Model:
* One-to-Many (1:M): Acustomer can place multiple orders, but each order belongs to onlyone customer.
Customers (1) --- (M) Orders
* Cardinality notation:
(1,1) # One-to-One
(0,M) # Zero-to-Many
(1,M) # One-to-Many
Why Other Options Are Incorrect:
* Option B (Physical design) (Incorrect):Focuses onstorage and indexing, not relationships.
* Option C (Attribute minimum) (Incorrect):No such formal term in database modeling.
* Option D (Partition) (Incorrect):Refers todividing tables, not relationship constraints.
Thus, the correct answer isCardinality, as it definesmin/max constraints on relationships.
NEW QUESTION # 22
Which expression can be used to create a temporary name for a table?
- A. UNION
- B. HAVING
- C. NEW
- D. ALIAS
Answer: D
Explanation:
Analiasis used in SQL to give atemporaryname to a table or column within a query. It makes queries more readable and helps in cases where a table needs to be referenced multiple times (e.g., in aself-join).
Example Usage:
sql
SELECT e.Name, d.DepartmentName
FROM Employees AS e
JOIN Departments AS d
ON e.DeptID = d.ID;
* Here,Employees is aliased as eandDepartments as d, making the query shorter and clearer.
Why Other Options Are Incorrect:
* Option A (HAVING) (Incorrect):Used to filter grouped results, not create aliases.
* Option B (NEW) (Incorrect):Not a valid SQL keyword for aliasing.
* Option D (UNION) (Incorrect):Combines result sets but does not rename tables.
Thus, the correct answer isALIAS, which allows fortemporary naming of tables or columns.
NEW QUESTION # 23
Which SQL command uses the correct syntax to add a new employee "John Doe" to the Employee table?
- A. INSERT Employee { "John Doe" };
- B. INSERT Employee (Name) Values ("John Doe");
- C. INSERT INTO Employee (Name) VALUES ("John Doe");
- D. INSERT INTO Employee ("John Doe");
Answer: C
Explanation:
Thecorrect syntaxfor inserting a new row into a table follows this structure:
Standard SQL INSERT Syntax:
sql
INSERT INTO TableName (Column1, Column2, ...)
VALUES (Value1, Value2, ...);
For this scenario:
sql
INSERT INTO Employee (Name) VALUES ('John Doe');
Why Other Options Are Incorrect:
* Option A (Incorrect):Uses incorrect syntax { ... }, which isnot valid SQL syntax.
* Option C (Incorrect):Does not specify the column name, whichcauses an error.
* Option D (Incorrect):Misses theINTOkeyword, which is required in standard SQL.
Thus, the correct syntax isOption B, ensuring aproperly formatted insert statement.
NEW QUESTION # 24
Which SELECT statement uses valid syntax for SQL?
- A. SELECT column1, column2 FROM table_name;
- B. SELECT ALL column1, column2 FROM table_name;
- C. SELECT column1, column2 WHERE condition FROM table_name;
- D. SELECT "column name", "column name" FROM "table name" WHERE "column 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 # 25
......
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