Redis Sorted Sets: ZCOUNT

Redis ZCOUNT Command

Redis ZCOUNT command is used to return the number of elements in the sorted set at the key with a score between minimum and maximum.

Here are some common uses and scenarios for the "ZCOUNT" command:

• Range Queries: Count members within a specified score range to retrieve relevant data.
• Data Analysis: Perform analytical operations by counting elements that meet specific score criteria.
• Segmentation: Segment data based on score ranges to facilitate further processing or analysis.
• Statistical Calculations: Count elements within certain score bounds for statistical calculations.

Syntax:

ZCOUNT KEY_NAME

Available since

2.0.0.

Return Value

Integer replies the number of elements in the specified score range.

Return Value Type

Integer

Example: Redis ZCOUNT: Any member may belong to the set

127.0.0.1:6379> ZADD mycolorset  528 white  2514 black 850 red 128 pink 742 yellow
(integer) 5
127.0.0.1:6379> ZADD mycolorset  158 orange 1500 green 645 blue 426 gray
(integer) 4
127.0.0.1:6379> ZCOUNT mycolorset -inf +inf
(integer) 9

Example : Redis ZCOUNT : When the value is over 800 or more

127.0.0.1:6379> ZADD mycolorset  528 white  2514 black 850 red 128 pink 742 yellow
(integer) 5
127.0.0.1:6379> ZADD mycolorset  158 orange 1500 green 645 blue 426 gray
(integer) 4
127.0.0.1:6379> ZCOUNT mycolorset 800 +inf
(integer) 3

Example: Redis ZCOUNT: When the value among 100 and 500

127.0.0.1:6379> ZADD mycolorset  528 white  2514 black 850 red 128 pink 742 yellow
(integer) 5
127.0.0.1:6379> ZADD mycolorset  158 orange 1500 green 645 blue 426 gray
(integer) 4
127.0.0.1:6379> ZCOUNT mycolorset 100 500
(integer) 3

Example: Redis ZCOUNT: When the value among 300 and less

127.0.0.1:6379> ZADD mycolorset  528 white  2514 black 850 red 128 pink 742 yellow
(integer) 5
127.0.0.1:6379> ZADD mycolorset  158 orange 1500 green 645 blue 426 gray
(integer) 4
127.0.0.1:6379> ZCOUNT mycolorset -inf 300
(integer) 2

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