ZUNION

Syntax

1. 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

1. dragonfly> ZADD zset1 1 "one"
2. (integer) 1
3. dragonfly> ZADD zset1 2 "two"
4. (integer) 1
5. dragonfly> ZADD zset2 1 "one"
6. (integer) 1
7. dragonfly> ZADD zset2 2 "two"
8. (integer) 1
9. dragonfly> ZADD zset2 3 "three"
10. (integer) 1
11. dragonfly> ZUNION 2 zset1 zset2
12. 1) "one"
13. 2) "three"
14. 3) "two"
15. dragonfly> ZUNION 2 zset1 zset2 WITHSCORES
16. 1) "one"
17. 2) "2"
18. 3) "three"
19. 4) "3"
20. 5) "two"
21. 6) "4"