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ZCARD

Last updated 
ZCARD key
Group
Sorted set
Complexity
O(1)
Arity
2 (exactly, counting the command name)
Flags
read-only, fast
Keys
first 1, last 1, step 1
HotKV Cloud
All plans
On-Premise
no license needed

ZCARD returns the number of members (the cardinality) of the sorted set stored at key.

Return value

Section titled “Return value”
Case RESP2 RESP3
Sorted set exists Integer: the number of members Same
Key does not exist Integer 0 Same

ZCARD replies with a WRONGTYPE error if key holds a value that is not a sorted set.

Examples

Section titled “Examples”
127.0.0.1:6379> ZADD board 100 "alice" 90 "bob"
(integer) 2
127.0.0.1:6379> ZCARD board
(integer) 2

Compatibility

Section titled “Compatibility”

Same as Redis 7.4 and Valkey 8.

See also

Section titled “See also”

ZCOUNT, ZLEXCOUNT, ZADD