diff options
Diffstat (limited to 'iredis/data/commands/zunionstore.md')
| -rw-r--r-- | iredis/data/commands/zunionstore.md | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/iredis/data/commands/zunionstore.md b/iredis/data/commands/zunionstore.md index 45b4b3b..49e2d50 100644 --- a/iredis/data/commands/zunionstore.md +++ b/iredis/data/commands/zunionstore.md @@ -1,22 +1,23 @@ Computes the union of `numkeys` sorted sets given by the specified keys, and -stores the result in `destination`. It is mandatory to provide the number of -input keys (`numkeys`) before passing the input keys and the other (optional) -arguments. +stores the result in `destination`. +It is mandatory to provide the number of input keys (`numkeys`) before passing +the input keys and the other (optional) arguments. By default, the resulting score of an element is the sum of its scores in the sorted sets where it exists. Using the `WEIGHTS` option, it is possible to specify a multiplication factor -for each input sorted set. This means that the score of every element in every -input sorted set is multiplied by this factor before being passed to the -aggregation function. When `WEIGHTS` is not given, the multiplication factors -default to `1`. +for each input sorted set. +This means that the score of every element in every input sorted set is +multiplied by this factor before being passed to the aggregation function. +When `WEIGHTS` is not given, the multiplication factors default to `1`. With the `AGGREGATE` option, it is possible to specify how the results of the -union are aggregated. This option defaults to `SUM`, where the score of an -element is summed across the inputs where it exists. When this option is set to -either `MIN` or `MAX`, the resulting set will contain the minimum or maximum -score of an element across the inputs where it exists. +union are aggregated. +This option defaults to `SUM`, where the score of an element is summed across +the inputs where it exists. +When this option is set to either `MIN` or `MAX`, the resulting set will contain +the minimum or maximum score of an element across the inputs where it exists. If `destination` already exists, it is overwritten. |