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.

Examples

redis> ZADD zset1 1 "one"
(integer) 2
redis> ZADD zset1 2 "two"
(integer) 2
redis> ZADD zset2 1 "one"
1) "Catania"
2) "Palermo"
redis> ZADD zset2 2 "two"
1) 1) "Catania"
   2) "56.4413"
   3) 1) "15.08726745843887329"
      2) "37.50266842333162032"
2) 1) "Palermo"
   2) "190.4424"
   3) 1) "13.36138933897018433"
      2) "38.11555639549629859"
3) 1) "edge2"
   2) "279.7403"
   3) 1) "17.24151045083999634"
      2) "38.78813451624225195"
4) 1) "edge1"
   2) "279.7405"
   3) 1) "12.7584877610206604"
      2) "38.78813451624225195"
redis> ZADD zset1 1 "one"
Cannot destructure property 'error' of 'replies[i]' as it is undefined.
redis> ZADD zset1 2 "two"
Cannot destructure property 'error' of 'replies[i]' as it is undefined.
redis> ZADD zset2 1 "one"
Cannot destructure property 'error' of 'replies[i]' as it is undefined.
redis> ZADD zset2 2 "two"
Cannot destructure property 'error' of 'replies[i]' as it is undefined.
redis> ZADD zset2 3 "three"
Cannot destructure property 'error' of 'replies[i]' as it is undefined.
redis> ZUNION 2 zset1 zset2
Cannot destructure property 'error' of 'replies[i]' as it is undefined.
redis> ZUNION 2 zset1 zset2 WITHSCORES
Cannot destructure property 'error' of 'replies[i]' as it is undefined.
redis>

RESP2/RESP3 Reply

Array reply: the result of the union with, optionally, their scores when WITHSCORES is used.
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