Object storage with hashes in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set a field 'name' with value 'Alice' in a Redis hash called 'user:1'.

Redis

HSET user:1 [1] Alice

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

Aname

Buser

Cvalue

Dfield

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'user' instead of the field name.

Confusing the field with the hash key.

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

2fill in blank

medium

Complete the code to get the value of the 'email' field from the Redis hash 'user:2'.

Redis

HGET user:2 [1]

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

Apassword

Bid

Cemail

Dusername

Attempts:

3 left

💡 Hint

Common Mistakes

Using the hash key instead of the field name.

Using a wrong field like 'username' or 'id'.

The HGET command retrieves the value of a specific field in a hash. Here, we want the 'email' field.

3fill in blank

hard

Fix the error in the code to delete the 'age' field from the Redis hash 'user:3'.

Redis

HDEL user:3 [1]

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

Auser:3

Bfield

Cdelete

Dage

Attempts:

3 left

💡 Hint

Common Mistakes

Using the hash key instead of the field name.

Using a command word like 'delete' as a field.

The HDEL command deletes one or more fields from a hash. The field to delete here is 'age'.

4fill in blank

hard

Fill both blanks to set the 'city' field to 'Paris' in the hash 'user:4' and then retrieve it.

Redis

HSET user:4 [1] Paris
HGET user:4 [2]

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

Acity

Bname

Dlocation

Attempts:

3 left

💡 Hint

Common Mistakes

Using different field names in set and get commands.

Using the hash key instead of the field name.

Both commands use the field 'city' to set and get the value in the hash.

5fill in blank

hard

Fill all three blanks to create a hash 'user:5' with fields 'name' and 'age', then retrieve the 'age' field.

Redis

HSET user:5 [1] John [2] 30
HGET user:5 [3]

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

Aname

Bage

Dusername

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up field names or using wrong fields.

Trying to get a field that was not set.

The HSET command sets multiple fields: 'name' with 'John' and 'age' with '30'. Then HGET retrieves the 'age' field.