ZADD key [NX|XX] [GT|LT] [CH] [INCR] score member [score member ...]
#Example
redis> ZADD myzset 1 "one"
(integer) 1
redis> ZADD myzset 1 "uno"
(integer) 1
redis> ZADD myzset 2 "two" 3 "three"
(integer) 2
redis> ZRANGE myzset 0 -1 WITHSCORES
1) "one"
2) "1"
3) "uno"
4) "1"
5) "two"
6) "2"
7) "three"
8) "3"
Add one or more members to a sorted set, or update its score if it already exists
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