HLEN for field count in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get the number of fields in the hash stored at key 'user:1000'.

Redis

HLEN [1]

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

Auser:1000

Bhash:user:1000

Cuser1000

Dfields:user1000

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong key name that does not exist.

Confusing the key with a field name.

The HLEN command returns the number of fields in the hash stored at the specified key. Here, the key is user:1000.

2fill in blank

medium

Complete the code to count fields in the hash stored at key 'session:abc123'.

Redis

HLEN [1]

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

Aabc123:session

Bsession_abc123

Csession:abc123

Dsession:123abc

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping parts of the key name.

Using underscores instead of colons.

The HLEN command counts the fields in the hash at the key session:abc123.

3fill in blank

hard

Fix the error in the command to get the field count of hash 'config:settings'.

Redis

HLEN [1]

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

Aconfig_settings

Bconfig:settings

Csettings:config

Dconfigsettings

Attempts:

3 left

💡 Hint

Common Mistakes

Replacing colons with underscores.

Mixing up the order of words in the key.

The correct key name is config:settings. Using underscores or other variations will cause errors or wrong results.

4fill in blank

hard

Fill both blanks to count fields in the hash with key 'profile:john_doe' using the Redis CLI.

Redis

[1] [2]

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

AHLEN

BHGETALL

Cprofile:john_doe

Duser:john_doe

Attempts:

3 left

💡 Hint

Common Mistakes

Using HGETALL instead of HLEN.

Using the wrong key name.

The Redis CLI command to count fields in a hash is HLEN followed by the key name. Here, the key is profile:john_doe.

5fill in blank

hard

Fill the blanks to write pseudo-code that counts fields in the hash 'settings:app' and stores the result in variable 'fieldCount'.

Redis

fieldCount = [1] [2]

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

AHLEN

Bsettings:app

CGET

DHGET

Attempts:

3 left

💡 Hint

Common Mistakes

Using HGET or GET instead of HLEN.

Mixing up the order of command and key.

To count fields in a hash, use HLEN with the key settings:app. Pseudo-code for storing the result: fieldCount = HLEN settings:app.