1|Page
WGU C427 OBJECTIVE ASSESSMENT FINAL EXAM
NEWEST 2026-2027 COMPLETE 300 QUESTIONS AND
CORRECT ANSWERS WITH RATIONALES (VERIFIED
ANSWERS) |ALREADY GRADED A+|BRAND NEW
VERSION!!
What are the rules that foreign keys must follow? -
ANSWER-1. Foreign key values may be repeated. 2.
Foreign key values may be NULL. 3. Foreign key values
must either be NULL or match some value of the
referenced primary key.
What is an SQL statement and how should it be formatted
for readability? - ANSWER-An SQL statement is a
complete command composed of one or more clauses.
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Good practice is to write each clause on a separate line
for readability.
Match the SQL syntax types with their descriptions and
examples: Literals, Keywords, Identifiers, Comments. -
ANSWER-- **Literals:** Explicit values that are string,
numeric, or binary. Examples: 'String', 123, x'0fa2' -
**Keywords:** Words with special meaning. Examples:
SELECT, FROM, WHERE - **Identifiers:** Objects from
the database like tables, columns, etc. Examples: City,
Name, Population - **Comments:** Statements intended
for humans, ignored by the database. Examples: -- single
line comment, /* multi-line comment */
,3|Page
How many clauses are in the following INSERT
statement? INSERT INTO Student VALUES (888, 'Smith',
'Jim', 3.0); - ANSWER-Two clauses: `INSERT INTO` and
`VALUES`.
Identify the error in the following SQL statement: SELECT
FirstName FROM Student WHERE LastName = Smith; -
ANSWER-The literal "Smith" must be surrounded by
single quotes or double quotes.
Identify the error in the following SQL statement: SELECT
FirstName from Student - ANSWER-A terminating
semicolon is missing.
, 4|Page
Identify the error in the following SQL statement: SELECT
Gpa --FROM Student; - ANSWER-The FROM clause is
commented out, making the statement incomplete.
What are the five sublanguages of SQL and their primary
functions? - ANSWER-1. **Data Definition Language
(DDL):** Defines the structure of the database. 2. **Data
Query Language (DQL):** Retrieves data from the
database. 3. **Data Manipulation Language (DML):**
Manipulates data stored in a database. 4. **Data Control
Language (DCL):** Controls database user access. 5.
**Data Transaction Language (DTL):** Manages database
transactions.
WGU C427 OBJECTIVE ASSESSMENT FINAL EXAM
NEWEST 2026-2027 COMPLETE 300 QUESTIONS AND
CORRECT ANSWERS WITH RATIONALES (VERIFIED
ANSWERS) |ALREADY GRADED A+|BRAND NEW
VERSION!!
What are the rules that foreign keys must follow? -
ANSWER-1. Foreign key values may be repeated. 2.
Foreign key values may be NULL. 3. Foreign key values
must either be NULL or match some value of the
referenced primary key.
What is an SQL statement and how should it be formatted
for readability? - ANSWER-An SQL statement is a
complete command composed of one or more clauses.
,2|Page
Good practice is to write each clause on a separate line
for readability.
Match the SQL syntax types with their descriptions and
examples: Literals, Keywords, Identifiers, Comments. -
ANSWER-- **Literals:** Explicit values that are string,
numeric, or binary. Examples: 'String', 123, x'0fa2' -
**Keywords:** Words with special meaning. Examples:
SELECT, FROM, WHERE - **Identifiers:** Objects from
the database like tables, columns, etc. Examples: City,
Name, Population - **Comments:** Statements intended
for humans, ignored by the database. Examples: -- single
line comment, /* multi-line comment */
,3|Page
How many clauses are in the following INSERT
statement? INSERT INTO Student VALUES (888, 'Smith',
'Jim', 3.0); - ANSWER-Two clauses: `INSERT INTO` and
`VALUES`.
Identify the error in the following SQL statement: SELECT
FirstName FROM Student WHERE LastName = Smith; -
ANSWER-The literal "Smith" must be surrounded by
single quotes or double quotes.
Identify the error in the following SQL statement: SELECT
FirstName from Student - ANSWER-A terminating
semicolon is missing.
, 4|Page
Identify the error in the following SQL statement: SELECT
Gpa --FROM Student; - ANSWER-The FROM clause is
commented out, making the statement incomplete.
What are the five sublanguages of SQL and their primary
functions? - ANSWER-1. **Data Definition Language
(DDL):** Defines the structure of the database. 2. **Data
Query Language (DQL):** Retrieves data from the
database. 3. **Data Manipulation Language (DML):**
Manipulates data stored in a database. 4. **Data Control
Language (DCL):** Controls database user access. 5.
**Data Transaction Language (DTL):** Manages database
transactions.
