Redis zcard 命令

ZCARD key

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

*返回值

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

*实例

redis>  ZADD myzset 1 “one”

(integer) 1

redis>  ZADD myzset 2 “two”

(integer) 1

redis>  ZCARD myzset

(integer) 2

redis>