ZUNION

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.

Return

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

Examples

redis> ZADD zset1 1 "one"
Failed to fetch
redis> ZADD zset1 2 "two"
Failed to fetch
redis> ZADD zset2 1 "one"
Failed to fetch
redis> ZADD zset2 2 "two"
Failed to fetch
redis> ZADD zset2 3 "three"
Failed to fetch
redis> ZUNION 2 zset1 zset2
Failed to fetch
redis> ZUNION 2 zset1 zset2 WITHSCORES
Failed to fetch