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+ZrangebyscoreCommand: Contents
ZRANGEBYSCORE _key_ _min_ _max_ `[`LIMIT _offset_ _count_`]` (Redis >
ZRANGEBYSCORE _key_ _min_ _max_ `[`LIMIT _offset_ _count_`]` `[`WITHSCORES`]` (Redis >
ZCOUNT _key_ _min_ _max_
Exclusive intervals and infinity
Return value
Examples +
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+ ZRANGEBYSCORE _key_ _min_ _max_ `[`LIMIT _offset_ _count_`]` (Redis >
ZRANGEBYSCORE _key_ _min_ _max_ `[`LIMIT _offset_ _count_`]` `[`WITHSCORES`]` (Redis >
ZCOUNT _key_ _min_ _max_
Exclusive intervals and infinity
Return value
Examples +
ZrangebyscoreCommand
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+ #sidebar SortedSetCommandsSidebar
Also while the interval is for default closed (inclusive) it's possible to specify open intervals prefixing the score with a "(" character, so for instance: +
ZCOUNT returns a Integer reply specifically the number of elements matching the specified score range. +
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+ ZRANGEBYSCORE _key_ _min_ _max_ `[`LIMIT _offset_ _count_`]` (Redis >
1.1) = +ZRANGEBYSCORE _key_ _min_ _max_ `[`LIMIT _offset_ _count_`]` `[`WITHSCORES`]` (Redis >
1.3.4) = +ZCOUNT _key_ _min_ _max_
+Time complexity: O(log(N))+O(M) with N being the number of elements in the sorted set and M the number of elements returned by the command, so if M is constant (for instance you always ask for the first ten elements with LIMIT) you can consider it O(log(N))Return the all the elements in the sorted set at key with a score between_min_ and max (including elements with score equal to min or max).+
The elements having the same score are returned sorted lexicographically asASCII strings (this follows from a property of Redis sorted sets and does notinvolve further computation).+
Using the optional LIMIT it's possible to get only a range of the matchingelements in an SQL-alike way. Note that if offset is large the commandsneeds to traverse the list for offset elements and this adds up to theO(M) figure.+
The ZCOUNT command is similar to ZRANGEBYSCORE but instead of returningthe actual elements in the specified interval, it just returns the numberof matching elements.
Exclusive intervals and infinity
+min and max can be -inf and +inf, so that you are not required to know what's the greatest or smallest element in order to take, for instance, elements "up to a given value".Also while the interval is for default closed (inclusive) it's possible to specify open intervals prefixing the score with a "(" character, so for instance: +
+ZRANGEBYSCORE zset (1.3 5 ++Will return all the values with score > 1.3 and <= 5, while for instance: +
+ZRANGEBYSCORE zset (5 (10 ++Will return all the values with score > 5 and < 10 (5 and 10 excluded). +
Return value
ZRANGEBYSCORE returns a Multi bulk reply specifically a list of elements in the specified score range.ZCOUNT returns a Integer reply specifically the number of elements matching the specified score range. +
Examples
++redis> zadd zset 1 foo +(integer) 1 +redis> zadd zset 2 bar +(integer) 1 +redis> zadd zset 3 biz +(integer) 1 +redis> zadd zset 4 foz +(integer) 1 +redis> zrangebyscore zset -inf +inf +1. "foo" +2. "bar" +3. "biz" +4. "foz" +redis> zcount zset 1 2 +(integer) 2 +redis> zrangebyscore zset 1 2 +1. "foo" +2. "bar" +redis> zrangebyscore zset (1 2 +1. "bar" +redis> zrangebyscore zset (1 (2 +(empty list or set) ++