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ZCARD key

相关命令

• ZADD
• ZCARD
• ZCOUNT
• ZINCRBY
• ZINTERSTORE
• ZLEXCOUNT
• ZRANGE
• ZRANGEBYLEX
• ZRANGEBYSCORE
• ZRANK
• ZREM
• ZREMRANGEBYLEX
• ZREMRANGEBYRANK
• ZREMRANGEBYSCORE
• ZREVRANGE
• ZREVRANGEBYSCORE
• ZREVRANK
• ZSCAN
• ZSCORE
• ZUNIONSTORE

Available since 1.2.0.

时间复杂度： O(1)

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.

例子

redis> ZADD myzset 1 "one"

(integer) 1

redis> ZADD myzset 2 "two"

(integer) 1

redis> ZCARD myzset

(integer) 2

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