Why hashes represent objects in Redis - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set a field 'name' with value 'Alice' in a Redis hash.

Redis

HSET user:1000 [1] Alice

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

Aname

Buser

C1000

Dfield

Attempts:

3 left

💡 Hint

Common Mistakes

Using the hash key instead of the field name.

Confusing the field with the value.

The HSET command sets a field in a Redis hash. Here, 'name' is the field key.

2fill in blank

medium

Complete the code to retrieve the value of the field 'age' from the Redis hash 'user:1000'.

Redis

HGET user:1000 [1]

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

Aage

Buser

C1000

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using the hash key instead of the field name.

Using a value instead of a field.

HGET fetches the value of a specific field in a Redis hash. Here, 'age' is the field name.

3fill in blank

hard

Fix the error in the code to get all fields and values from the hash 'user:1000'.

Redis

[1] user:1000

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

AHGET

BGETALL

CGET

DHGETALL

Attempts:

3 left

💡 Hint

Common Mistakes

Using GET or GETALL which are for strings, not hashes.

Using HGET which returns only one field.

HGETALL returns all fields and values in a Redis hash. Other commands do not work for hashes.

4fill in blank

hard

Fill both blanks to set multiple fields 'name' and 'age' in the hash 'user:1000'.

Redis

HMSET user:1000 [1] [2]

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

Aname Alice

Bage 30

Cname Bob

Dage 25

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong field names or values.

Putting both field and value in one option incorrectly.

HMSET sets multiple fields in a hash. Here, 'name Alice' and 'age 30' set two properties.

5fill in blank

hard

Fill all three blanks to create a hash 'user:1000' with fields 'name', 'age', and 'email'.

Redis

HMSET user:1000 [1] [2] [3]

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

Aname Alice

Bage 30

Cemail [e-mail]

Dphone 123456

Attempts:

3 left

💡 Hint

Common Mistakes

Including unrelated fields like 'phone'.

Mixing field names and values incorrectly.

HMSET sets multiple fields in a hash. Here, we set 'name', 'age', and 'email' fields to represent the object.