No-SQL----zcard， zcount

zcard 计算集合中元素的数量

redis> zadd myset 1 "one"
(integer) 1
redis> zadd myset 2 "two"
(integer) 1
redis> zcard myset
(integer) 2

zcount 返回指定分数范围的成员个数

zcount key min max
redis 127.0.0.1:6379> zadd myset 1 "aa"
(integer) 1
redis 127.0.0.1:6379> zadd myset 1 "bb"
(integer) 1
redis 127.0.0.1:6379> zadd myset 2 "cc" 3 "dd"
(integer) 2
redis 127.0.0.1:6379> zcount myset 1 3
(integer) 4