SMEMBERS to list all in Redis - Cheat Sheet & Quick Revision

Recall & Review

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What does the Redis command SMEMBERS do?

The SMEMBERS command returns all the members of a set stored at a given key in Redis.

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How do you use SMEMBERS to get all elements of a set named fruits?

You run SMEMBERS fruits. This command lists all members inside the fruits set.

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Can SMEMBERS return duplicate elements?

No, sets in Redis do not allow duplicates, so SMEMBERS returns unique members only.

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What type of data structure must the key hold to use SMEMBERS?

The key must hold a set data structure in Redis to use SMEMBERS.

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If the key does not exist, what does SMEMBERS return?

SMEMBERS returns an empty array if the key does not exist.

What does the Redis command SMEMBERS myset return?

A Deletes the set 'myset'

B The number of members in 'myset'

C A random member from 'myset'

D All members of the set stored at key 'myset'

SMEMBERS returns all members of the set stored at the specified key.

If the key does not exist, what will SMEMBERS return?

A An empty list

B An error

C Null

D The string 'nil'

SMEMBERS returns an empty list if the key does not exist.

Which Redis data type is required to use SMEMBERS?

A String

B Set

C List

D Hash

SMEMBERS works only on sets.

Can SMEMBERS return duplicate values?

A No, sets do not allow duplicates

B Only if the key is a list

C Only if the set is large

D Yes, if duplicates exist

Sets in Redis store unique values, so SMEMBERS returns unique members only.

Which command would you use to get all members of a set named 'colors'?

A SADD colors

B GET colors

C SMEMBERS colors

D HGETALL colors

SMEMBERS colors lists all members of the set 'colors'.

Explain what the Redis command SMEMBERS does and when you would use it.

Think about how you get all items from a collection that stores unique values.

Describe the difference between SMEMBERS and commands that return single or count values from a set.

Compare what each command returns about the set.