Returns the number of members in a sorted set.
ZCARD
key
Returns the sorted set cardinality (number of elements) of the sorted
set stored at key
.
Integer reply: the cardinality (number of members) of the sorted set, or 0 if the key doesn’t exist.
O(1)
@fast @read @sortedset
127.0.0.1:6379> ZADD myzset 1 "one"
(integer) 1
127.0.0.1:6379> ZADD myzset 2 "two"
(integer) 1
127.0.0.1:6379> ZCARD myzset
(integer) 2
BZMPOP, BZPOPMAX, BZPOPMIN, ZADD, ZCOUNT, ZDIFF, ZDIFFSTORE, ZINCRBY, ZINTER, ZINTERCARD, ZINTERSTORE, ZLEXCOUNT, ZMPOP, ZMSCORE, ZPOPMAX, ZPOPMIN, ZRANDMEMBER, ZRANGE, ZRANGESTORE, ZRANK, ZREM, ZREMRANGEBYLEX, ZREMRANGEBYRANK, ZREMRANGEBYSCORE, ZREVRANK, ZSCAN, ZSCORE, ZUNION, ZUNIONSTORE.