ZUNION numkeys key [key ...] [WEIGHTS weight [weight ...]] [AGGREGATE SUM | MIN | MAX] [WITHSCORES]

Available since: 6.2.0

Time complexity: 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.

ACL categories: @read @sortedset @slow

This command is similar to ZUNIONSTORE, but instead of storing the resulting sorted set, it is returned to the client.

For a description of the WEIGHTS and AGGREGATE options, see ZUNIONSTORE.


Array reply: the result of union (optionally with their scores, in case the WITHSCORES option is given).


ZADD zset1 1 "one" ZADD zset1 2 "two" ZADD zset2 1 "one" ZADD zset2 2 "two" ZADD zset2 3 "three" ZUNION 2 zset1 zset2 ZUNION 2 zset1 zset2 WITHSCORES