Redis

ZCARD key

Returns the sorted set cardinality (number of elements) of the sorted set stored at key.

Return value

Integer reply: the cardinality (number of elements) of the sorted set, or 0 if key does not exist.

Examples

redis>  ZADD myzset 1 "one"
(integer) 1
redis>  ZADD myzset 2 "two"
(integer) 1
redis>  ZCARD myzset
(integer) 2
redis> 
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