SET and GET commands in Redis - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the Redis SET command do?

The SET command stores a value with a specified key in Redis. It saves data so you can get it later.

beginner

How do you retrieve a value stored in Redis?

Use the GET command with the key to get the stored value back.

beginner

What happens if you use GET on a key that does not exist?

Redis returns null (or nil) because there is no value stored for that key.

intermediate

Can the SET command overwrite an existing key's value?

Yes, SET replaces the old value with the new one if the key already exists.

beginner

What is a simple example of using SET and GET in Redis?

Example:<br>SET name "Alice"<br>Then:<br>GET name<br>Returns: Alice

What does the Redis SET command require as input?

A Only a value

B A key and a value

C Only a key

D A key, value, and expiration time

The SET command needs both a key and a value to store data.

What will GET mykey return if mykey does not exist?

A An error message

B An empty string

C The string "null"

D A null or nil value

Redis returns a null or nil value when the key is not found.

If you run SET user "Bob" and then SET user "Alice", what will GET user return?

A "Alice"

B "Bob"

C An error

D Both values

The second SET overwrites the first value, so GET user returns "Alice".

Which command retrieves the value of a key in Redis?

A DEL

B SET

C GET

D EXPIRE

GET is used to retrieve the value stored at a key.

What type of data structure do SET and GET commands work with in Redis?

A Strings

B Hashes

C Sets

D Lists

SET and GET work with string values stored by keys.

Explain how the Redis SET and GET commands work together to store and retrieve data.

Think about saving and looking up a label on a box.

Describe what happens if you try to get a key that was never set in Redis.

Imagine looking for a box label that is not there.