SET expression for adding/changing in DynamoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the attribute 'age' to 30 in the DynamoDB update expression.

DynamoDB

UpdateExpression = "SET age = [1]"

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

A30

B"30"

Cage + 1

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around numbers, which makes them strings.

Trying to increment with SET instead of ADD.

The SET expression assigns the attribute 'age' the value 30 directly.

2fill in blank

medium

Complete the code to add 5 to the existing 'score' attribute using SET expression.

DynamoDB

UpdateExpression = "SET score = score [1] :increment"

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

A+

B*

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-' which subtracts instead of adds.

Using '*' or '/' which multiply or divide.

The SET expression uses '+' to add the increment value to 'score'.

3fill in blank

hard

Fix the error in the SET expression to update the 'count' attribute by adding 1.

DynamoDB

UpdateExpression = "SET count = count [1] 1"

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

A-

B+

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-' which decreases the value.

Using '*' or '/' which change the value incorrectly.

The '+' operator correctly adds 1 to the 'count' attribute.

4fill in blank

hard

Fill both blanks to set 'status' to 'active' and increment 'visits' by 1.

DynamoDB

UpdateExpression = "SET status = [1], visits = visits [2] :inc"

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

A:active

B+

C-

D"active"

Attempts:

3 left

💡 Hint

Common Mistakes

Using direct string without placeholder.

Using '-' to decrement visits.

Use the placeholder ':active' for the string value and '+' to increment 'visits'.

5fill in blank

hard

Fill all three blanks to set 'level' to 5, 'active' to true, and increase 'points' by 10.

DynamoDB

UpdateExpression = "SET level = [1], active = [2], points = points [3] :pts"

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

A5

Btrue

C+

D"true"

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around booleans.

Using '-' instead of '+' for points.

Set 'level' to number 5, 'active' to boolean true, and add points using '+'.