Commandszunion
ZUNION
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Compute the union
Usage: zunion 2 src_key1 src_key2.
Each member score is added by default if not specified.
| src_key1 = | { (1,A), | (2,B), | (3,C) | } | |
| src_key2 = | { | (4,B), | (5,C) | (6,D) | } |
| Result = | { (1,A), | (6,B), | (8,C), | (6,D) | } |
Example
| Command> | zunion 2 src_key1 src_key2 withscores |
| Result> |
1) "A" 2) "1" 3) "B" 4) "6" 5) "D" 6) "6" 7) "C" 8) "8" |
Using weights
Usage: zunion 2 src_key1 src_key2 weights 2 3.
The first weight 2 is multiplied by each score of src_key1, and the second weight 3 is multiplied by each score of src_key2.
| src_key1 = | { (1,A), | (2,B), | (3,C) } | -> | { (1*2,A) (2*2,B) | (3*2,C) } | |
| src_key2 = | { | (4,B), | (5,C), | (6,D) } | -> | { (4*3,B) | (5*3,C) (6*3,D) } |
| Result | = | { (2,A) (4+12,B) | (6+15,C) (18,D) } | ||||
| = | { (2,A) (16,B) | (21,C) (18,D) } |
Example
| Command> | zunion 2 src_key1 src_key2 weights 2 3 withscores |
| Result> |
1) "A" 2) "2" 3) "B" 4) "16" 5) "D" 6) "18" 7) "C" 8) "21" |
Using aggregate
Usage: zunion 2 src_key1 src_key2 aggregate sum|min|max.
sum adds the scores. If aggregate is omitted, sum is the default.
min takes the smaller score of each member, and max takes the larger score.
| src_key1 = | { (1,A), | (2,B), | (3,C) } | |
| src_key2 = | { | (4,B), | (5,C), | (6,D) } |
| aggregate min = | { (1,A) | (2,B), | (3,C), | (6,D) } |
| aggregate max = | { (1,A) | (4,B), | (5,C), | (6,D) } |
Example
| Command> | zunion 2 src_key1 src_key2 aggregate min withscores |
| Result> |
1) "A" 2) "1" 3) "B" 4) "2" 5) "C" 6) "3" 7) "D" 8) "6" |
| Command> | zunion 2 src_key1 src_key2 aggregate max withscores |
| Result> |
1) "A" 2) "1" 3) "B" 4) "4" 5) "C" 6) "5" 7) "D" 8) "6" |
Syntax
ZUNION numkeys key [key ...] [WEIGHTS weight [weight ...]] [AGGREGATE SUM|MIN|MAX] [WITHSCORES]
- Available since version 6.2.0.
- Time complexity is O(N)+O(M*log(M)).
| Related commands | ZINTER, | ZDIFF |
| << ZREMRANGEBYLEX | ZUNION | ZINTER >> |
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