Redis Sets: SINTERSTORE

SINTERSTORE destination key1 [key2]

Redis SINTERSTORE command is used to store the members of the set resulting from the intersection of all the specified sets in a specific key. Keys that do not exist are considered to be empty sets and if one of the keys being an empty set, the resulting set is also empty.

Syntax:

SINTERSTORE DESTINATION_KEY KEY KEY1..KEYN

Available since:

1.0.0.

Return Value:

Integer replies the number of elements in the resulting set.

Return Value Type:

Integer

Example: Redis SINTERSTORE of two sets

mycolor1 = {R G B} 
mycolor2 = {G B Y} 
SINTERSTORE dest_key mycolor1 mycolor2 = {G B}

127.0.0.1:6379> SADD mycolor1 R G B
(integer) 3
127.0.0.1:6379> SADD mycolor2 G B Y
(integer) 3
127.0.0.1:6379> SINTERSTORE dest_key mycolor1 mycolor2
(integer) 2
127.0.0.1:6379> SMEMBERS dest_key
1) "G"
2) "B"

Example: Redis SINTERSTORE of three sets

mycolor1 = {R G B} 
mycolor2 = {G B Y} 
mycolor3 = {B W O} 
SINTERSTORE dest_key myset1 myset2 myset3 = {B} 

127.0.0.1:6379> SADD mycolor3 B W O
(integer) 3
127.0.0.1:6379> SINTERSTORE dest_key mycolor1 mycolor2 mycolor3
(integer) 1
127.0.0.1:6379> SMEMBERS dest_key
1) "B"