Why update expressions modify attributes in DynamoDB - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to update the attribute 'Age' to 30 in DynamoDB.

DynamoDB

UpdateExpression='SET Age = [1]'

Drag options to blanks, or click blank then click option'

A30

BAge

C'Age'

D30+1

Attempts:

3 left

💡 Hint

Common Mistakes

Using attribute name instead of value

Adding quotes around numbers incorrectly

The update expression uses SET to assign the value 30 to the attribute 'Age'.

2fill in blank

medium

Complete the code to increment the attribute 'Score' by 5 using an update expression.

DynamoDB

UpdateExpression='SET Score = Score [1] 5'

Drag options to blanks, or click blank then click option'

A/

B-

C*

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction or multiplication instead of addition

The + operator increments the 'Score' attribute by 5.

3fill in blank

hard

Fix the error in the update expression to remove the attribute 'Status'.

DynamoDB

UpdateExpression='[1] Status'

Drag options to blanks, or click blank then click option'

AREMOVE

BDELETE

CSET

DADD

Attempts:

3 left

💡 Hint

Common Mistakes

Using DELETE instead of REMOVE

Using SET to remove attributes

The REMOVE keyword deletes an attribute from the item.

4fill in blank

hard

Fill both blanks to set 'Level' to 10 and add 20 to 'Points' in the update expression.

DynamoDB

UpdateExpression='SET Level = [1], Points = Points [2] 20'

Drag options to blanks, or click blank then click option'

A10

B+

C-

D30

Attempts:

3 left

💡 Hint

Common Mistakes

Using minus instead of plus

Setting wrong values

We set 'Level' to 10 and add 20 to 'Points' using the plus operator.

5fill in blank

hard

Fill all three blanks to set 'Status' to 'Active', increment 'Visits' by 1, and remove 'TempFlag'.

DynamoDB

UpdateExpression='SET Status = [1], Visits = Visits [2] 1 REMOVE [3]'

Drag options to blanks, or click blank then click option'

A'Active'

B+

CTempFlag

D'Inactive'

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around strings

Using wrong attribute names

We set 'Status' to 'Active', add 1 to 'Visits', and remove the 'TempFlag' attribute.