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WGU Data Management – Foundations Exam Sample Questions (Q58-Q63):
NEW QUESTION # 58
Which statement uses valid syntax for the DELETE statement in SQL?
Answer: C
Explanation:
Thecorrect syntaxfor deleting records from a table in SQL is:
sql
DELETE FROM table_name WHERE condition;
This deletesonly the rowsthat match the condition.
Example Usage:
sql
DELETE FROM Employees WHERE Salary < 30000;
* Deletesall employees earning less than $30,000.
Why Other Options Are Incorrect:
* Option A (Incorrect):Missing FROMkeyword. The correct syntax is DELETE FROM table_name.
* Option C (Partially Correct):DELETE FROM table_name;deletes all rows, but it lacks a WHERE clause.
* Option D (Incorrect):DELETE *is not validin SQL. The correct command is just DELETE FROM.
Thus, the correct answer isDELETE FROM table_name WHERE condition;.
NEW QUESTION # 59
Which object relates an entity to itself in an entity-relationship model?
Answer: A
Explanation:
Areflexive relationship(also called aunary relationship) occurs when anentity is related to itself.
Example Usage:
A screenshot of a computer AI-generated content may be incorrect.
CREATE TABLE Employees (
EmpID INT PRIMARY KEY,
Name VARCHAR(50),
ManagerID INT,
FOREIGN KEY (ManagerID) REFERENCES Employees(EmpID)
);
* ManagerIDrefers to another employeewithin the same table.
Why Other Options Are Incorrect:
* Option A (Repository) (Incorrect):A data storage structure, not a relationship type.
* Option B (Relationship instance) (Incorrect):Describesa specific connection between entities, not a reflexive relationship.
* Option D (Attribute) (Incorrect):Attributes storecharacteristics, butdo not define relationships.
Thus, the correct answer isReflexive relationship, as it relates an entity to itself.
NEW QUESTION # 60
Which type of entity only exists in a logical sense?
Answer: B
Explanation:
Anintangible entityis an entity that does not have a physical presence but still holds meaning in a database.
These entities representconcepts, relationships, or abstract datathat exist in a logical sense.
Example Usage in Databases:
* Customer Loyalty Status (Gold, Silver, Bronze)
* Theloyalty levelis anintangible entitysince it is derived from other data (purchase history).
* Online User Sessions
* Asession IDexistslogically in the systembut does not have a tangible presence like a product or employee.
Why Other Options Are Incorrect:
* Option A (Concrete entity) (Incorrect):No such formal term in database design.
* Option B (Tangible entity) (Incorrect):Represents somethingphysical, like anemployeeorproduct.
* Option D (Physical entity) (Incorrect):Refers todata stored on disk, like database tables or indexes.
Thus, the correct answer isIntangible entity, as it only exists in a logical sense within the database.
NEW QUESTION # 61
Which keyword combines INSERTS, UPDATES, and DELETES operations into a single statement?
Answer: A
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 # 62
Which description defines a data type?
Answer: B
Explanation:
Adata typedefines the kind of data a column can store in a database. It ensures data consistency and efficient storage.
* Option A (Correct):A data type is anamed set of values, such asINTEGER, VARCHAR, DATE, etc.
* Option B (Incorrect):A tuple refers to arowin a relational database, not a data type.
* Option C (Incorrect):Data typesdefinecolumn values, but they do not correspond directly to columns.
* Option D (Incorrect):Data types do not have avaryingset of rows; they define attributes for columns.
NEW QUESTION # 63
......
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