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

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 value

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

*Examples

redis>  ZADD zset1 1 "one"
(integer) 1
redis>  ZADD zset1 2 "two"
(integer) 1
redis>  ZADD zset2 1 "one"
(integer) 1
redis>  ZADD zset2 2 "two"
(integer) 1
redis>  ZADD zset2 3 "three"
(integer) 1
redis>  ZUNION 2 zset1 zset2
ERR Unknown or disabled command 'ZUNION'
redis>  ZUNION 2 zset1 zset2 WITHSCORES
ERR Unknown or disabled command 'ZUNION'
redis>