Union

Description

This operation creates a union of values from the specified sorted sets. A union is a set made by combining the elements of two or more sets. When a value appears in more than one input sorted set, the resulting score is a sum of the scores from each sorted set.

Method

Backendless.Hive( hiveName ).SortedSetStore.union( keyNames ): Promise<values>;

where:

Argument	Description
hiveName	Name of a hive where the operation is performed. String value.
keyNames	An array containing key names each identifying a sorted-set. Must be an array of string values.

Return Value

An array of combined values from all input sorted sets (duplicates excluded). The structure of the response is an array of arrays. Each individual element of the top level array is an array consisting of two elements - score and value. The score is the sum of all individual scores for the corresponding values from all referenced sorted sets.

Example

Consider the following sorted sets:

The example below retrieves a union of values from the sample sorted sets shown above:

await Backendless.Hive( 'leaderboard' ).SortedSetStore.union( [League1Players', 'League2Players'] )

where:

Argument	Description
'leaderboard'	Name of the hive in the system.

Response

[  
  [  
    11,  
    "Charlie"  
  ],  
  [  
    13,  
    "Adam"  
  ],  
  [  
    24,  
    "Frank"  
  ],  
  [  
    26,  
    "Dave"  
  ],  
  [  
    28,  
    "Bobby"  
  ]  
]

Codeless Reference

where:

Argument	Description
hive name	Name of a hive where the operation is performed.
key names	A list containing key names identifying unique sorted sets.

Returns a list of combined values from all input sorted sets (duplicates excluded). The structure of the response is a list of lists. Each individual element of the top level list is a list consisting of two elements - score and value. The score is the sum of all individual scores for the corresponding values from all referenced sorted sets.

Consider the following Sorted Set storage:

The example below retrieves a union of values from the sample sorted sets shown above:


The output will look as shown below after the Codeless logic runs. For identical values found in the specified sorted sets the score is summed.