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ZUNION

Syntax​

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

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​

dragonfly$> ZADD zset1 1 "one"
(integer) 1
dragonfly$> ZADD zset1 2 "two"
(integer) 1
dragonfly$> ZADD zset2 1 "one"
(integer) 1
dragonfly$> ZADD zset2 2 "two"
(integer) 1
dragonfly$> ZADD zset2 3 "three"
(integer) 1
dragonfly$> ZUNION 2 zset1 zset2
1) "one"
2) "three"
3) "two"
dragonfly$> ZUNION 2 zset1 zset2 WITHSCORES
1) "one"
2) "2"
3) "three"
4) "3"
5) "two"
6) "4"