ZCARD

Syntax
ZCARD key
Available since:
1.2.0
Time complexity:
O(1)
ACL categories:
@read, @sortedset, @fast,

返回存储在key的有序集合的基数（元素数量）。

示例

ZADD myzset 1 "one" ZADD myzset 2 "two" ZCARD myzset

RESP2/RESP3 回复

Integer reply: the cardinality (number of members) of the sorted set, or 0 if the key doesn't exist.
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