redis ZCOUNT command
Translation results：
count
英[kaʊnt] 美[kaʊnt]
n.Total number; Count; Count; Arguments
v. Count ;Calculate the total; count...;Important
Third person singular: counts Plural: counts Present participle: counting Past tense: counted Past participle: counted
redis ZCOUNT commandsyntax
Function:Returns the number of members in the ordered set key whose score value is between min and max (the default includes score value equal to min or max).
Syntax: ZCOUNT key min max
Available versions:>= 2.0.0
Time complexity Degree: O(log(N) M), N is the cardinality of the ordered set, M is the number of elements with values between min and max.
Return: The number of members whose score value is between min and max.
redis ZCOUNT commandexample
redis> ZRANGE salary 0 -1 WITHSCORES # 测试数据 1) "jack" 2) "2000" 3) "peter" 4) "3500" 5) "tom" 6) "5000" redis> ZCOUNT salary 2000 5000 # 计算薪水在 2000-5000 之间的人数 (integer) 3 redis> ZCOUNT salary 3000 5000 # 计算薪水在 3000-5000 之间的人数 (integer) 2