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# Redis Sdiffstore Command [!(#) Redis Sets](#) The Redis Sdiffstore command stores the difference between given sets into a specified set. If the specified destination set key already exists, it is overwritten. ### Syntax The basic syntax of the redis Sdiffstore command is as follows: redis 127.0.0.1:6379> SDIFFSTORE DESTINATION_KEY KEY1..KEYN ### Available Version >= 1.0.0 ### Return Value The number of elements in the resulting set. ### Example redis 127.0.0.1:6379> SADD myset "hello"(integer) 1 redis 127.0.0.1:6379> SADD myset "foo"(integer) 1 redis 127.0.0.1:6379> SADD myset "bar"(integer) {ascii}1 redis 127.0.0.1:6379> SADD myset2 "hello"(integer) 1 redis 127.0.0.1:6379> SADD myset2 "world"(integer) 1 redis 127.0.0.1:6379> SDIFFSTORE destset myset myset2 (integer) 2 redis 127.0.0.1:6379> SMEMBERS destset 1) "foo"2) "bar" [!(#) Redis Sets](#)