ZCARD for set size in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get the number of elements in the sorted set named 'myzset'.

Redis

ZCARD [1]

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

Amyzset

Bmyset

Csortedset

Dset1

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong key name.

Confusing sorted sets with regular sets.

The ZCARD command returns the number of elements in the sorted set specified by its key. Here, the key is myzset.

2fill in blank

medium

Complete the code to get the size of the sorted set stored in the variable 'keyName'.

Redis

ZCARD [1]

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

Akeyname

BkeyName

Ckey_name

Dkey

Attempts:

3 left

💡 Hint

Common Mistakes

Changing the case of the key name.

Using a different variable name.

The ZCARD command requires the exact key name. Here, the variable keyName holds the key, so it should be used as is.

3fill in blank

hard

Fix the error in the command to correctly get the size of the sorted set 'players'.

Redis

ZCARD [1]

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

Aplayers

Bplayer

Cplayerz

Dplayrs

Attempts:

3 left

💡 Hint

Common Mistakes

Misspelling the key name.

Using a singular form instead of plural.

The key name must exactly match the sorted set's name. Here, the correct key is players.

4fill in blank

hard

Fill both blanks to get the size of the sorted set stored in variable 'setKey' and store the result in variable 'count'.

Redis

count = [1] [2] setKey

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

AZCARD

B=

C==

DGET

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' instead of '=' for assignment.

Using 'GET' which is not valid for sorted sets.

To get the size of a sorted set in Redis and assign it to a variable, use count = ZCARD setKey. The = assigns the result.

5fill in blank

hard

Fill all three blanks to write a Redis command that stores the size of the sorted set 'scores' into variable 'size', then prints it.

Redis

size [1] [2] scores
PRINT [3]

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

A=

BZCARD

Csize

DGET

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'GET' instead of 'ZCARD' to get size.

Printing the key name instead of the variable.

The command assigns the size of the sorted set 'scores' to size using = and ZCARD. Then it prints the variable size.