ZUNION

Syntax
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

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

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