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WGU Data Management – Foundations Exam Sample Questions (Q33-Q38):

NEW QUESTION # 33
Which keyword can be used as a clause in an ALTER TABLE statement?

A. CHANGE
B. STOP
C. AGGREGATE
D. DELETE

Answer: A

Explanation:
TheALTER TABLEstatement is used to modify an existing database table structure. One common clause is CHANGE, which allows renaming a column and modifying its data type.
Example:
sql
ALTER TABLE Employees CHANGE COLUMN OldName NewName VARCHAR(50);
* Option A (Incorrect):DELETE is used to removerows, not alter table structure.
* Option B (Correct):CHANGE is avalid clausefor renaming and modifying columns in MySQL and some other databases.
* Option C (Incorrect):STOP is not a valid SQL keyword for altering tables.
* Option D (Incorrect):AGGREGATE refers to functions like SUM() and AVG(), not table alterations.

NEW QUESTION # 34
How can a primary key constraint be added after the table is created?

A. By using an ALTER clause
B. By using an INSERT INTO clause
C. By using an UPDATE clause
D. By using the CREATE TABLE statement

Answer: A

Explanation:
Toadd a primary key constraint after table creation, we use theALTER TABLEstatement.
Example Usage:
sql
ALTER TABLE Employees
ADD CONSTRAINT PK_Employees PRIMARY KEY (EmpID);
* Thisaddsa primary key to the EmpID columnafter the table was created.
Why Other Options Are Incorrect:
* Option B (CREATE TABLE) (Incorrect):Used for defining constraintsduringtable creation, not after.
* Option C (UPDATE) (Incorrect):Modifiesrow values, not constraints.
* Option D (INSERT INTO) (Incorrect):Used toadd datato a table, not modify constraints.
Thus, the correct answer isALTER TABLE, as itmodifies table structure to add a primary key constraint.

NEW QUESTION # 35
Which SELECT statement uses valid syntax for SQL?

A. SELECT column1, column2 FROM table_name;
B. SELECT column1, column2 WHERE condition FROM table_name;
C. SELECT ALL column1, column2 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 # 36
Which keyword can be used to combine two results into one table?

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

Answer: A

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 # 37
Which capability should databases maintain to simplify the use of SQL with a general-purpose language?

A. The storage manager to interpret low-level file-system commands
B. The query processor to deliver results
C. The ability to reverse results if needed
D. The use of an application programming interface

Answer: D

Explanation:
Databases need to supportApplication Programming Interfaces (APIs)to enable seamless integration with general-purpose programming languageslike Python, Java, and C#. APIs likeODBC (Open Database Connectivity) and JDBC (Java Database Connectivity)allow applications to interact with databases without requiring complex SQL commands.
* Option A (Incorrect):Thestorage manageris responsible for managing low-levelfile system operations, but it does not simplify SQL integration with programming languages.
* Option B (Incorrect):The ability toreverse results(e.g., using ORDER BY DESC) is a SQL feature but is unrelated to integration with programming languages.
* Option C (Incorrect):Thequery processoroptimizes and executes SQL queries but does not provide an interface for application development.
* Option D (Correct):APIsallow databases to be accessed easily from different programming environments, simplifying integration.

NEW QUESTION # 38
......

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