WGU D191 OBJECTIVE
ASSESSMENT ACTUAL EXAM
2025/2026 COMPLETE QUESTIONS
WITH CORRECT DETAILED ANSWERS
|| 100% GUARANTEED PASS
<BRAND NEW VERSION>
1. Information Technology - ANSWER ✓ The technology used in creating,
maintaining, and making information accessible.
2. IT Professional Roles - ANSWER ✓ Administration and Support
3. System Administrator - ANSWER ✓ Maintains all aspects of the system
including hardware, software, and programming.
4. -d flag - ANSWER ✓ Specifies the database name in the psql command.
5. -h flag - ANSWER ✓ Specifies the hostname of the database in the psql
command.
6. -p flag - ANSWER ✓ Specifies the database port in the psql command.
7. ANALYZE command - ANSWER ✓ Collects statistics about tables and
indices and stores them in internal tables.
8. boolean - ANSWER ✓ A data type used to represent true or false.
9. COPY command - ANSWER ✓ Transfers data from a database to a file, or
from a file to a database.
,10.COUNT function - ANSWER ✓ Returns the number of rows without a
NULL value in the column.
11.cross join - ANSWER ✓ Returns every possible combination of rows from
the first table and the second table.
12.DISTINCT keyword - ANSWER ✓ Eliminates all the duplicate records and
fetches only unique records.
13.EXPLAIN command - ANSWER ✓ Displays the plan for a query before it
is executed.
14.FROM clause - ANSWER ✓ Specifies the database tables or views involved
in the SELECT statement.
15.GROUP BY clause - ANSWER ✓ Divides the rows of a dataset into
multiple groups based on some sort of key.
16.HAVING clause - ANSWER ✓ Enables a user to specify conditions that
filter which group results appear in the output.
17.inner join - ANSWER ✓ Selects all rows from both participating tables as
long as there is a match between the columns.
18.interquartile range - ANSWER ✓ Refers to the difference between the first
quartile and the third quartile.
19.JavaScript Object Notation - ANSWER ✓ An open standard text format for
storing data of varying complexity.
20.left outer join - ANSWER ✓ Returns all the records from the first table and
only matching records from the second table.
21.LIMIT clause - ANSWER ✓ Sets an upper limit on the number of tuples
returned by SQL.
,22.n-quantiles - ANSWER ✓ A set of n-1 points used to divide a variable into n
groups.
23.ORDER BY keyword - ANSWER ✓ Sorts the rows and columns of the
database table.
24.OVER keyword - ANSWER ✓ Specifies the partitioning, ordering, and
window on which the analytic function operates.
25.PARTITION BY keyword - ANSWER ✓ Divides the result set into
partitions and performs computation on each subset of the partitioned data.
26.pg_cancel_backend command - ANSWER ✓ Causes the interpreter to end
the query specified by the process ID (pid).
27.pg_sleep command - ANSWER ✓ Allows the SQL interpreter to essentially
do nothing for the next defined period of time.
28.qualitative data - ANSWER ✓ The data that can be arranged categorically
based on the attributes and properties of a thing.
29.relational database - ANSWER ✓ A database that utilizes the relational
model of data.
30.right outer join - ANSWER ✓ Returns all records from the right table
(table2), and the matched records from the left table (table1).
31.ROW_NUMBER() function - ANSWER ✓ Gives the current row number
within a partition.
32.SELECT command - ANSWER ✓ Retrieves zero or more rows from one or
more database tables or database views.
33.SQLAlchemy Engine - ANSWER ✓ Contains information about the type of
database and a connection pool.
34.TRUNCATE TABLE - ANSWER ✓ delete all data from table leaving
structure intact
, 35.DROP TABLE - ANSWER ✓ deletion of a table
36.DELETE FROM table_name
WHERE conditional; - ANSWER ✓ delete specific data/rows from a table
37.DROP DATABASE - ANSWER ✓ Dropping a database
38.ALTER TABLE table_name
ALTER COLUMN column_name TIMESTAMP
DEFAULT current_timestamp; - ANSWER ✓ adding column in table to
store a timestamp
39.ALTER TABLE table_name
ALTER COLUMN column_name1
TYPE CHARACTER VARYING( ),
ALTER COLUMN column_name1
SET NOT NULL; - ANSWER ✓ modify a column in table using ALTER
command
40.ALTER TABLE CHEESES
ADD COLUMN description TEXT NOT NULL DEFAULT 'screwed';
ALTER TABLE CHEESES
ALTER COLUMN description DROP DEFAULT; - ANSWER ✓ add
column to table and be a multi-lined text field that IS required.
41.COMMENT ON TABLE table_name IS 'your text here'; - ANSWER ✓
adding a comment to a table
42.INSERT INTO test2 (name, id)
SELECT name, id
FROM test1
WHERE name > 'm'; - ANSWER ✓ insert data from one table to another
43.INSERT INTO table_name1 (make, model, year)
SELECT *
FROM table_name2
ASSESSMENT ACTUAL EXAM
2025/2026 COMPLETE QUESTIONS
WITH CORRECT DETAILED ANSWERS
|| 100% GUARANTEED PASS
<BRAND NEW VERSION>
1. Information Technology - ANSWER ✓ The technology used in creating,
maintaining, and making information accessible.
2. IT Professional Roles - ANSWER ✓ Administration and Support
3. System Administrator - ANSWER ✓ Maintains all aspects of the system
including hardware, software, and programming.
4. -d flag - ANSWER ✓ Specifies the database name in the psql command.
5. -h flag - ANSWER ✓ Specifies the hostname of the database in the psql
command.
6. -p flag - ANSWER ✓ Specifies the database port in the psql command.
7. ANALYZE command - ANSWER ✓ Collects statistics about tables and
indices and stores them in internal tables.
8. boolean - ANSWER ✓ A data type used to represent true or false.
9. COPY command - ANSWER ✓ Transfers data from a database to a file, or
from a file to a database.
,10.COUNT function - ANSWER ✓ Returns the number of rows without a
NULL value in the column.
11.cross join - ANSWER ✓ Returns every possible combination of rows from
the first table and the second table.
12.DISTINCT keyword - ANSWER ✓ Eliminates all the duplicate records and
fetches only unique records.
13.EXPLAIN command - ANSWER ✓ Displays the plan for a query before it
is executed.
14.FROM clause - ANSWER ✓ Specifies the database tables or views involved
in the SELECT statement.
15.GROUP BY clause - ANSWER ✓ Divides the rows of a dataset into
multiple groups based on some sort of key.
16.HAVING clause - ANSWER ✓ Enables a user to specify conditions that
filter which group results appear in the output.
17.inner join - ANSWER ✓ Selects all rows from both participating tables as
long as there is a match between the columns.
18.interquartile range - ANSWER ✓ Refers to the difference between the first
quartile and the third quartile.
19.JavaScript Object Notation - ANSWER ✓ An open standard text format for
storing data of varying complexity.
20.left outer join - ANSWER ✓ Returns all the records from the first table and
only matching records from the second table.
21.LIMIT clause - ANSWER ✓ Sets an upper limit on the number of tuples
returned by SQL.
,22.n-quantiles - ANSWER ✓ A set of n-1 points used to divide a variable into n
groups.
23.ORDER BY keyword - ANSWER ✓ Sorts the rows and columns of the
database table.
24.OVER keyword - ANSWER ✓ Specifies the partitioning, ordering, and
window on which the analytic function operates.
25.PARTITION BY keyword - ANSWER ✓ Divides the result set into
partitions and performs computation on each subset of the partitioned data.
26.pg_cancel_backend command - ANSWER ✓ Causes the interpreter to end
the query specified by the process ID (pid).
27.pg_sleep command - ANSWER ✓ Allows the SQL interpreter to essentially
do nothing for the next defined period of time.
28.qualitative data - ANSWER ✓ The data that can be arranged categorically
based on the attributes and properties of a thing.
29.relational database - ANSWER ✓ A database that utilizes the relational
model of data.
30.right outer join - ANSWER ✓ Returns all records from the right table
(table2), and the matched records from the left table (table1).
31.ROW_NUMBER() function - ANSWER ✓ Gives the current row number
within a partition.
32.SELECT command - ANSWER ✓ Retrieves zero or more rows from one or
more database tables or database views.
33.SQLAlchemy Engine - ANSWER ✓ Contains information about the type of
database and a connection pool.
34.TRUNCATE TABLE - ANSWER ✓ delete all data from table leaving
structure intact
, 35.DROP TABLE - ANSWER ✓ deletion of a table
36.DELETE FROM table_name
WHERE conditional; - ANSWER ✓ delete specific data/rows from a table
37.DROP DATABASE - ANSWER ✓ Dropping a database
38.ALTER TABLE table_name
ALTER COLUMN column_name TIMESTAMP
DEFAULT current_timestamp; - ANSWER ✓ adding column in table to
store a timestamp
39.ALTER TABLE table_name
ALTER COLUMN column_name1
TYPE CHARACTER VARYING( ),
ALTER COLUMN column_name1
SET NOT NULL; - ANSWER ✓ modify a column in table using ALTER
command
40.ALTER TABLE CHEESES
ADD COLUMN description TEXT NOT NULL DEFAULT 'screwed';
ALTER TABLE CHEESES
ALTER COLUMN description DROP DEFAULT; - ANSWER ✓ add
column to table and be a multi-lined text field that IS required.
41.COMMENT ON TABLE table_name IS 'your text here'; - ANSWER ✓
adding a comment to a table
42.INSERT INTO test2 (name, id)
SELECT name, id
FROM test1
WHERE name > 'm'; - ANSWER ✓ insert data from one table to another
43.INSERT INTO table_name1 (make, model, year)
SELECT *
FROM table_name2
