How to select unique values ​​from an array in redis?

Question

Redis

I need to merge several arrays and get unique values, you can merge using SUNION, but how to isolate unique values?

Answer 1

If you have a SUNION, then you have sets, and in sets the values ​​are already unique.

$ redis-cli
127.0.0.1:6379> sadd set1 a b c
(integer) 3
127.0.0.1:6379> sadd set2 b c d
(integer) 3
127.0.0.1:6379> sunion set1 set2
1) "b"
2) "c"
3) "d"
4) "a"