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WGU Data Management – Foundations Exam Sample Questions (Q43-Q48):

NEW QUESTION # 43
Which operator defines the field that the index is using in a CREATE TABLE statement?

A. ON
B. IN
C. UNIQUE
D. CHECK

Answer: A

Explanation:
TheONkeyword specifies the field used by anindexwhen creating it in SQL.
Example Usage:
sql
CREATE INDEX idx_employee_name
ON Employees(Name);
* Here, an indexidx_employee_nameis createdon the Name column.
* Thisimproves query performancewhen filtering by Name.
Why Other Options Are Incorrect:
* Option B (IN) (Incorrect):Used in queries to match values in a set, not for indexing.
* Option C (UNIQUE) (Incorrect):Ensures a column has unique values but doesnot define an index field.
* Option D (CHECK) (Incorrect):Used forvalidating column values, not for indexing.
Thus, the correct answer isON, as it defines thecolumn on which an index is created.

NEW QUESTION # 44
Which description defines a data type?

A. It is an unnamed tuple of values.
B. It has a name and a varying set of rows.
C. It is a named set of values.
D. It has values corresponding to columns.

Answer: C

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 # 45
Which function removes only the leading spaces from a string?

A. REPLACE
B. TRIM
C. LEFT
D. LTRIM

Answer: D

Explanation:
TheLTRIM()function in SQL removesleading spaces(spaces at the beginning of a string) while keeping spaces at the end.
Example Usage:
sql
SELECT LTRIM(' Hello World') AS TrimmedText;
Output:
bash
'Hello World'
Why Other Options Are Incorrect:
* Option B (LEFT) (Incorrect):Used for extracting a portion of a string. Example:
sql
SELECT LEFT('Hello World', 5); -- Output: 'Hello'
* Option C (TRIM) (Incorrect):Removesboth leading and trailing spaces, not just leading ones.
Example:
sql
SELECT TRIM(' Hello World '); -- Output: 'Hello World'
* Option D (REPLACE) (Incorrect):Replaces occurrences of one substring with another but doesnot specifically remove spaces.
Thus, the correct answer isLTRIM(), which removes onlyleading spaces.

NEW QUESTION # 46
Which SELECT statement uses valid syntax for SQL?

A. SELECT "column name", "column name" FROM "table name" WHERE "column name"
B. SELECT column1, column2 FROM table_name;
C. SELECT ALL column1, column2 FROM table_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 # 47
Which operation finds an entry containing a search value by repeatedly splitting the index in two?

A. Fan-out
B. Index scan
C. Table scan
D. Binary search

Answer: D

Explanation:
Binary searchis an algorithm that finds a search value byrepeatedly dividing the search space into two halves. It is commonly used inindexed searches.
Example Usage in Databases:
* B-Trees and B+ Trees(used in database indexing) applybinary searchto navigate the index efficiently.
* If searching for ID = 50 in asorted list of IDs, binary search:
* Splits the list into two halves.
* Checks the middle value.
* Eliminates half of the dataset.
* Repeats until the value is found.
Why Other Options Are Incorrect:
* Option A (Table scan) (Incorrect):Readsevery row,much slowerthan binary search.
* Option C (Index scan) (Incorrect):Uses indexes but does not necessarily apply binary search.
* Option D (Fan-out) (Incorrect):Describesbranching in B-Trees, not searching.
Thus, the correct answer isBinary search, as it repeatedlysplits the indexin two.

NEW QUESTION # 48
......

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WGU Data Management – Foundations Exam Sample Questions (Q43-Q48):

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