20/ 2 5 & that's 80% RETAKE
® 20 questions were answered correctly.
5 questions were answered incorrectly.
Te
In each milestone, you may want or need to use the database
and query tool to answer some of the questions. We suggest you
open the tool in another browser tab while you are working on
this assessment.
https://postgres.sophia.org/
Which of the following properties are specific to the durability
property?
In the event of system failure, no
transactions that were done can
© O
be undone.
A transaction should be treated
as a single logical unit of work
that is indivisible.
If any of the transaction parts
violates an integrity constraint,
QO the entire transaction must be
aborted.
, Data used in one transaction
cannot be used in another
O transaction until the first
transaction is completed.
RATIONALE
The durability property ensures that once a transaction is done and
committed, the changes cannot be undone or lost, even if there is
a system failure.
CONCEPT
— ACID Properties
2 @
In each milestone, you may want or need to use the database
and query tool to answer some of the questions. We suggest you
open the tool in another browser tab while you are working on
this assessment.
https://postgres.sophia.org/
What is the main function of the WHERE clause in SQL?
To retrieve zero or more rows
from one or more database
Oo
columns
To identify one or more tables as
O the source for a query
To apply conditions to filter the
o O dataset
, CONCEPT
— SQL Clauses
2 @
What type of key can be used in an associative entity?
A surrogate primary key
A natural primary key
O
A composite primary key
© Oo
No key is needed with an
O associative entity.
RATIONALE
When an associative entity is created, the database designer can
set the primary key as the combination of the foreign keys, which is
called a composite key. Or, the designer can choose to create a
new primary key.
CONCEPT
— Associative Entities
4“ @
In each milestone, you may want or need to use the database
and query tool to answer some of the questions. We suggest you
open the tool in another browser tab while you are working on
this assessment.
https://postgres.sophia.org/
® 20 questions were answered correctly.
5 questions were answered incorrectly.
Te
In each milestone, you may want or need to use the database
and query tool to answer some of the questions. We suggest you
open the tool in another browser tab while you are working on
this assessment.
https://postgres.sophia.org/
Which of the following properties are specific to the durability
property?
In the event of system failure, no
transactions that were done can
© O
be undone.
A transaction should be treated
as a single logical unit of work
that is indivisible.
If any of the transaction parts
violates an integrity constraint,
QO the entire transaction must be
aborted.
, Data used in one transaction
cannot be used in another
O transaction until the first
transaction is completed.
RATIONALE
The durability property ensures that once a transaction is done and
committed, the changes cannot be undone or lost, even if there is
a system failure.
CONCEPT
— ACID Properties
2 @
In each milestone, you may want or need to use the database
and query tool to answer some of the questions. We suggest you
open the tool in another browser tab while you are working on
this assessment.
https://postgres.sophia.org/
What is the main function of the WHERE clause in SQL?
To retrieve zero or more rows
from one or more database
Oo
columns
To identify one or more tables as
O the source for a query
To apply conditions to filter the
o O dataset
, CONCEPT
— SQL Clauses
2 @
What type of key can be used in an associative entity?
A surrogate primary key
A natural primary key
O
A composite primary key
© Oo
No key is needed with an
O associative entity.
RATIONALE
When an associative entity is created, the database designer can
set the primary key as the combination of the foreign keys, which is
called a composite key. Or, the designer can choose to create a
new primary key.
CONCEPT
— Associative Entities
4“ @
In each milestone, you may want or need to use the database
and query tool to answer some of the questions. We suggest you
open the tool in another browser tab while you are working on
this assessment.
https://postgres.sophia.org/
