Stores the union of multiple sorted sets in a key.
ZUNIONSTORE destination
numkeys key [key…]
[WEIGHTS weight
[weight…]] [AGGREGATE
<SUM |
MIN |
MAX>]
Computes the union of numkeys sorted sets given by the
specified keys, and stores the result in destination. It is
mandatory to provide the number of input keys (numkeys)
before passing the input keys and the other (optional) arguments.
By default, the resulting score of an element is the sum of its scores in the sorted sets where it exists.
Using the WEIGHTS option, it is possible to specify a
multiplication factor for each input sorted set. This means that the
score of every element in every input sorted set is multiplied by this
factor before being passed to the aggregation function. When
WEIGHTS is not given, the multiplication factors default to
1.
With the AGGREGATE option, it is possible to specify how
the results of the union are aggregated. This option defaults to
SUM, where the score of an element is summed across the
inputs where it exists. When this option is set to either
MIN or MAX, the resulting set will contain the
minimum or maximum score of an element across the inputs where it
exists.
If destination already exists, it is overwritten.
Integer reply: the number of elements in the resulting sorted set.
O(N)+O(M log(M)) with N being the sum of the sizes of the input sorted sets, and M being the number of elements in the resulting sorted set.
@slow @sortedset @write
If an option WEIGHTS or AGGREGATE is given
multiple times, it is undefined which option takes precedence.
127.0.0.1:6379> ZADD zset1 1 "one"
(integer) 1
127.0.0.1:6379> ZADD zset1 2 "two"
(integer) 1
127.0.0.1:6379> ZADD zset2 1 "one"
(integer) 1
127.0.0.1:6379> ZADD zset2 2 "two"
(integer) 1
127.0.0.1:6379> ZADD zset2 3 "three"
(integer) 1
127.0.0.1:6379> ZUNIONSTORE out 2 zset1 zset2 WEIGHTS 2 3
(integer) 3
127.0.0.1:6379> ZRANGE out 0 -1 WITHSCORES
1) "one"
2) "5"
3) "three"
4) "9"
5) "two"
6) "10"BZMPOP, BZPOPMAX, BZPOPMIN, ZADD, ZCARD, ZCOUNT, ZDIFF, ZDIFFSTORE, ZINCRBY, ZINTER, ZINTERCARD, ZINTERSTORE, ZLEXCOUNT, ZMPOP, ZMSCORE, ZPOPMAX, ZPOPMIN, ZRANDMEMBER, ZRANGE, ZRANGESTORE, ZRANK, ZREM, ZREMRANGEBYLEX, ZREMRANGEBYRANK, ZREMRANGEBYSCORE, ZREVRANK, ZSCAN, ZSCORE, ZUNION.