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WGU Data Management – Foundations Exam Sample Questions (Q59-Q64):

NEW QUESTION # 59
Which SELECT statement uses valid syntax for SQL?

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

Answer: B

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 # 60
What does the aggregate function do?

A. It eliminates one or more columns of a table.
B. It computes values over a set of rows.
C. It selects rows that appear in one table but not another.
D. It lists combinations of rows in two tables.

Answer: B

Explanation:
Anaggregate functionperforms acalculation over multiple rowsand returns asingle value. Examples include SUM(), AVG(), MAX(), MIN(), and COUNT()in SQL.
* Option A (Correct):Aggregate functions compute values over aset of rows, like summingtotal sales or averaging grades.
* Option B (Incorrect):Selecting rows that appear in one table but not another is done usingset operations (EXCEPT or MINUS in SQL).
* Option C (Incorrect):Eliminating columns is done using thePROJECToperation orSELECT with specific columns.
* Option D (Incorrect):Combining rows from two tables refers to aJOIN operation, not aggregation.

NEW QUESTION # 61
Which keyword can be used to combine two results into one table?

A. MERGE
B. UNION
C. CONSOLIDATE
D. INTEGRATE

Answer: B

Explanation:
TheUNIONkeyword in SQL is used tocombine the resultsof two or more SELECT queries into asingle result setwhile removing duplicate rows.
Example:
sql
SELECT Name FROM Employees
UNION
SELECT Name FROM Managers;
* Option A (Correct):UNION combines results from multiple queries into one set,removing duplicates.
* Option B (Incorrect):MERGE is not a valid SQL keyword for combining result sets (it is used insome database systems for data merging).
* Option C (Incorrect):INTEGRATE is not a SQL keyword.
* Option D (Incorrect):CONSOLIDATE is not an SQL keyword.

NEW QUESTION # 62
Which relationship exists between occurrences of the same entity types?

A. Cardinality
B. Modality
C. Binary
D. Unary

Answer: D

Explanation:
Aunary relationship(also known as arecursive relationship) occurs when an entityrelates to itself.
Example Usage:
* Employees and Managers:
sql
CREATE TABLE Employees (
EmpID INT PRIMARY KEY,
Name VARCHAR(50),
ManagerID INT,
FOREIGN KEY (ManagerID) REFERENCES Employees(EmpID)
);
* Here, ManagerIDreferences another Employee# aunary (self-referential) relationship.
Why Other Options Are Incorrect:
* Option A (Modality) (Incorrect):Describesoptional vs. mandatoryrelationships, not self-referencing.
* Option C (Cardinality) (Incorrect):Defines how many instances relate,not the type of relationship.
* Option D (Binary) (Incorrect):Binary relationships involvetwo different entities, not self-referencing.
Thus, the correct answer isUnary, as it describesrelationships within the same entity type.

NEW QUESTION # 63
Which term refers to a path from a top-level block to a bottom-level block?

A. Sparse index
B. Fan-out
C. Crow's foot
D. Branch

Answer: D

Explanation:
In database indexing, abranchrefers to thepath from the top-level block (root node) to a bottom-level block (leaf node)in aB-Tree or B+ Tree index structure.
Example Usage in Indexing:
* AB-Tree indexorganizes data hierarchically, withbranches leading to different parts of the tree.
* When searching for a record, thequery follows a branchfrom theroot node down to the correct leaf node.
Why Other Options Are Incorrect:
* Option A (Fan-out) (Incorrect):Refers tohow many children a node has, not the path.
* Option B (Crow's foot) (Incorrect):Anotation used in ER diagrams, not indexing.
* Option D (Sparse index) (Incorrect):A type of indexstoring only some entries, not the path itself.
Thus, the correct answer isBranch, as it defines thepath from top to bottom in a database index.

NEW QUESTION # 64
......

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