Attribute types (S, N, B, BOOL, L, M) in DynamoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify a string attribute type in DynamoDB.

DynamoDB

AttributeValue = {"[1]": "Hello"}

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

AN

BBOOL

CB

DS

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'N' which stands for Number instead of String.

In DynamoDB, the attribute type for strings is S.

2fill in blank

medium

Complete the code to specify a number attribute type in DynamoDB.

DynamoDB

AttributeValue = {"[1]": "123"}

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

AS

BN

CBOOL

DL

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'S' which stands for String instead of Number.

In DynamoDB, the attribute type for numbers is N.

3fill in blank

hard

Fix the error in the code to correctly specify a boolean attribute type in DynamoDB.

DynamoDB

AttributeValue = {"[1]": true}

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

ABOOL

BB

CS

DN

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'B' which means Binary instead of 'BOOL' for boolean.

The correct attribute type for boolean values in DynamoDB is BOOL.

4fill in blank

hard

Fill both blanks to create a list attribute with two string items in DynamoDB.

DynamoDB

AttributeValue = {"[1]": [ {"S": "apple"}, {"[2]": "banana"} ]}

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

AL

BN

CS

DBOOL

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'N' for list or string items.

The outer attribute type for a list is L, and each string item inside uses S.

5fill in blank

hard

Fill all three blanks to create a map attribute with two keys and their string values in DynamoDB.

DynamoDB

AttributeValue = {"[1]": {"name": {"[2]": "John"}, "city": {"[3]": "Paris"}}}

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

AL

BM

CS

DBOOL

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'L' for map or 'BOOL' for string values.

The map attribute type is M, and the string values inside use S.

Practice

1.

Which DynamoDB attribute type is used to store plain text strings?

easy

A. B

B. N

C. BOOL

D. S

Solution

1. Step 1: Understand attribute types in DynamoDB

   DynamoDB uses attribute types to define data kinds. 'S' stands for string (text).

2. Step 2: Match the type to text data

   Since 'S' means string, it is the correct type for plain text.

3. Final Answer:

   S -> Option D

4. Quick Check:

   Text data = S [OK]

Hint: Text data always uses type S in DynamoDB [OK]

Common Mistakes:

• Confusing N (number) with S (string)
• Choosing BOOL for text
• Using B for text data

2.

Which of the following is the correct syntax to define a boolean attribute named isActive in a DynamoDB item?

{"isActive": {"BOOL": true}}

easy

A. {"isActive": {"S": "true"}}

B. {"isActive": {"BOOL": true}}

C. {"isActive": {"N": 1}}

D. {"isActive": {"B": true}}

Solution

1. Step 1: Identify the correct attribute type for boolean

   Boolean values in DynamoDB use the BOOL type with true or false.

2. Step 2: Check the syntax for boolean attribute

   The correct syntax is {"isActive": {"BOOL": true}} to represent a boolean true.

3. Final Answer:

   {"isActive": {"BOOL": true}} -> Option B

4. Quick Check:

   Boolean attribute uses BOOL type [OK]

Hint: Use BOOL type with true/false for boolean values [OK]

Common Mistakes:

• Using S type with string 'true'
• Using N type with 1 instead of BOOL
• Using B type for boolean

3.

Given the following DynamoDB item attribute, what is the type of tags?

{"tags": {"L": [ {"S": "red"}, {"S": "blue"}, {"S": "green"} ] }}

medium

A. List (L)

B. Map (M)

C. String (S)

D. Binary (B)

Solution

1. Step 1: Identify the attribute type key

   The attribute uses the key "L", which stands for List in DynamoDB.

2. Step 2: Understand the value structure

   The value is an array of strings, confirming it is a list of string elements.

3. Final Answer:

   List (L) -> Option A

4. Quick Check:

   Attribute key L means List [OK]

Hint: Look for L key to identify lists in DynamoDB [OK]

Common Mistakes:

• Confusing L with M (map)
• Thinking it's a string because of S inside list
• Choosing B for binary data

4.

Identify the error in this DynamoDB attribute definition:

{"profile": {"M": {"age": {"S": 30}, "name": {"S": "Alice"}}}}

medium

A. The name attribute should use type N, not S

B. The map (M) type cannot contain nested attributes

C. The age attribute should use type N, not S

D. Binary (B) type is missing for profile

Solution

1. Step 1: Analyze the attribute types inside the map

   The map contains "age" with type S and value 30, and "name" with type S and value "Alice".

2. Step 2: Check if types match values

   Age is a number (30), so it should use type N, not S (string). Name is correctly a string.

3. Final Answer:

   Age attribute should use type N, not S -> Option C

4. Quick Check:

   Numbers use N type, not S [OK]

Hint: Numbers inside maps must use N type, not S [OK]

Common Mistakes:

• Using S for numbers
• Thinking maps can't nest attributes
• Confusing name type as number

5.

You want to store a user's profile with a list of phone numbers and a map of address details in DynamoDB. Which attribute types should you use for phoneNumbers and address respectively?

hard

A. phoneNumbers: L, address: M

B. phoneNumbers: M, address: L

C. phoneNumbers: S, address: B

D. phoneNumbers: BOOL, address: N

Solution

1. Step 1: Identify the type for a list of phone numbers

   A list of phone numbers is a collection, so it should use the List (L) type.

2. Step 2: Identify the type for address details as key-value pairs

   Address details are structured data with keys and values, so Map (M) type is appropriate.

3. Final Answer:

   phoneNumbers: L, address: M -> Option A

4. Quick Check:

   Lists = L, Maps = M [OK]

Hint: Use L for lists, M for maps (objects) in DynamoDB [OK]

Common Mistakes:

• Swapping L and M types
• Using S for lists
• Using BOOL or N incorrectly