Redis

ZINTERSTORE destination numkeys key [key ...] [WEIGHTS weight [weight ...]] [AGGREGATE SUM|MIN|MAX]

Computes the intersection 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.

By default, the resulting score of an element is the sum of its scores in the sorted sets where it exists. Because intersection requires an element to be a member of every given sorted set, this results in the score of every element in the resulting sorted set to be equal to the number of input sorted sets.

For a description of the WEIGHTS and AGGREGATE options, see ZUNIONSTORE.

If destination already exists, it is overwritten.

Return value

Integer reply: the number of elements in the resulting sorted set at destination.

Examples

redis>  ZADD zset1 1 "one"
(integer) 1
redis>  ZADD zset1 2 "two"
(integer) 1
redis>  ZADD zset2 1 "one"
(integer) 1
redis>  ZADD zset2 2 "two"
(integer) 1
redis>  ZADD zset2 3 "three"
(integer) 1
redis>  ZINTERSTORE out 2 zset1 zset2 WEIGHTS 2 3
(integer) 2
redis>  ZRANGE out 0 -1 WITHSCORES
1) "one"
2) "5"
3) "two"
4) "10"
redis> 
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