PASS GUARANTEED QUIZ WGU - AUTHORITATIVE VALID DATA-MANAGEMENT-FOUNDATIONS EXAM DISCOUNT

Pass Guaranteed Quiz WGU - Authoritative Valid Data-Management-Foundations Exam Discount

Pass Guaranteed Quiz WGU - Authoritative Valid Data-Management-Foundations Exam Discount

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WGU Data Management – Foundations Exam Sample Questions (Q37-Q42):

NEW QUESTION # 37
Which keyword determines if a value is within a range of values?

  • A. OR
  • B. LIKE
  • C. IN
  • D. BETWEEN

Answer: D

Explanation:
TheBETWEENkeyword in SQL is used tofilter values within a specified range. It is particularly useful for numeric and date-based queries.
Syntax of BETWEEN:
sql
SELECT * FROM Employees WHERE Salary BETWEEN 50000 AND 100000;
* Retrievesall employees whose salary is between $50,000 and $100,000 (inclusive).
Why Other Options Are Incorrect:
* Option A (LIKE) (Incorrect):Used forpattern matchingwith wildcards (%, _). Example:
sql
SELECT * FROM Customers WHERE Name LIKE 'A%';
* Option B (IN) (Incorrect):Used tomatch a value in a specified set, butnot a range. Example:
sql
SELECT * FROM Employees WHERE Department IN ('HR', 'Finance', 'IT');
* Option C (OR) (Incorrect):Used forlogical conditions, but doesnot check a range. Example:
sql
SELECT * FROM Products WHERE Price < 10 OR Price > 50;
Thus, the correct choice is BETWEEN for filtering values within arange.


NEW QUESTION # 38
How can a primary key constraint be added after the table is created?

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

Answer: C

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 # 39
Which clause from a SELECT statement immediately accompanies the SELECT clause in MySQL?

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

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 # 40
Which keyword can be used as a clause in an ALTER TABLE statement?

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

Answer: D

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 # 41
What is the first step of the analysis phase for designing a database?

  • A. Identify entities
  • B. Implement attributes
  • C. Draw an entity-relationship (ER) diagram
  • D. Determine cardinality

Answer: A

Explanation:
Thefirst stepin database analysis isidentifying entities, which are thereal-world objectsthat need to be represented in the database.
Example Usage:
* In a school system, the mainentitiescould be:
Students, Courses, Instructors
Why Other Options Are Incorrect:
* Option A (Determine cardinality) (Incorrect):Determining relationships comesafteridentifying entities.
* Option C (Draw an ER diagram) (Incorrect):ER diagramsvisualizeentities but arenot the first step.
* Option D (Implement attributes) (Incorrect):Attributes aredefined afterentities are identified.
Thus, the correct answer isIdentify entities, asentities form the foundation of the databasemodel.


NEW QUESTION # 42
......

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