Redis Commands
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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

Last: Zscore