Why sorted sets combine uniqueness with ordering in Redis - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add a member with a score to a sorted set in Redis.

Redis

ZADD myset 10 [1]

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

Amember1

BmemberX

CmemberA

DmemberZ

Attempts:

3 left

💡 Hint

Common Mistakes

Putting the member before the score.

Using a command other than ZADD.

The command ZADD myset 10 memberA adds the member memberA with score 10 to the sorted set myset.

2fill in blank

medium

Complete the code to retrieve members from the sorted set ordered by score ascending.

Redis

ZRANGE myset 0 [1]

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

A-1

B5

C10

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using a positive number that limits the output.

Confusing the order of arguments.

The command ZRANGE myset 0 -1 returns all members from the sorted set myset ordered by score from lowest to highest.

3fill in blank

hard

Fix the error in the command to add a member with score 15 to the sorted set.

Redis

ZADD myset 15 [1]

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

Ascore15

Bmember15

C15

Dmember

Attempts:

3 left

💡 Hint

Common Mistakes

Putting the member before the score.

Using a number as the member name.

The correct syntax is ZADD myset score member. So the member name should be after the score.

4fill in blank

hard

Fill both blanks to retrieve members with scores between 5 and 20 inclusive.

Redis

ZRANGEBYSCORE myset [1] [2]

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

A5

B20

C(5

D(20

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses which exclude the boundary scores.

Swapping the min and max values.

The command ZRANGEBYSCORE myset 5 20 returns members with scores from 5 to 20 inclusive.

5fill in blank

hard

Fill all three blanks to increment the score of 'memberA' by 5 in the sorted set.

Redis

ZINCRBY [1] [2] [3]

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

Amyset

B5

CmemberA

DmemberB

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the increment and member arguments.

Using the wrong key name.

The command ZINCRBY myset 5 memberA increases the score of memberA by 5 in the sorted set myset.