Why patterns guide Redis usage - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set a key-value pair in Redis.

Redis

SET [1] "Hello"

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

ADEL

BGET

Cgreeting

DEXPIRE

Attempts:

3 left

💡 Hint

Common Mistakes

Using a command like GET instead of a key name.

Leaving the key blank.

The SET command stores a value under a key. Here, the key should be a name like greeting.

2fill in blank

medium

Complete the code to retrieve the value of a key in Redis.

Redis

GET [1]

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

Agreeting

BDEL

Cvalue

DSET

Attempts:

3 left

💡 Hint

Common Mistakes

Using a command name instead of a key.

Using a different key name than the one stored.

The GET command retrieves the value stored under the given key. Here, the key is greeting.

3fill in blank

hard

Fix the error in the code to delete a key in Redis.

Redis

DEL [1]

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

AGET

BEXPIRE

CSET

Dgreeting

Attempts:

3 left

💡 Hint

Common Mistakes

Using a command name instead of a key.

Trying to delete a key that does not exist.

The DEL command deletes the key and its value. You must specify the key name, here greeting.

4fill in blank

hard

Fill both blanks to set a key with an expiration time in seconds.

Redis

SET [1] "SessionData" [2] 300

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

Asession_key

BEX

CPX

DDEL

Attempts:

3 left

💡 Hint

Common Mistakes

Using PX instead of EX for seconds.

Using a command name instead of a key.

The SET command can take EX to set expiration time in seconds. The key name here is session_key.

5fill in blank

hard

Fill all three blanks to add a member with a score to a sorted set in Redis.

Redis

ZADD [1] [2] [3]

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

Aleaderboard

B1500

Cplayer1

Dsession

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the order of score and member.

Using a wrong key name or command instead of the set name.

The ZADD command adds a member with a score to a sorted set. Here, leaderboard is the set name, 1500 is the score, and player1 is the member.