Redis Sdiff Command

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Redis Sdiff Command

Redis Sets

The Redis Sdiff command returns the difference between the first set and other sets, which can also be considered the unique elements in the first set. Non-existent set keys are treated as empty sets.

The difference result comes from the preceding FIRST_KEY, rather than the following OTHER_KEY1, nor is it the difference of the entire FIRST_KEY OTHER_KEY1..OTHER_KEYN.

Example:

key1 = {a,b,c,d}
key2 = {c}
key3 = {a,c,e}
SDIFF key1 key2 key3 = {b,d}

Syntax

The basic syntax of the redis Sdiff command is as follows:

redis 127.0.0.1:6379> SDIFF FIRST_KEY OTHER_KEY1..OTHER_KEYN

Available Version

>= 1.0.0

Return Value

A list containing the members of the difference.

Example

redis> SADD key1 "a"
(integer) 1
redis> SADD key1 "b"
(integer) 1
redis> SADD key1 "c"
(integer) 1
redis> SADD key2 "c"
(integer) 1
redis> SADD key2 "d"
(integer) 1
redis> SADD key2 "e"
(integer) 1
redis> SDIFF key1 key2
1) "a"
2) "b"
redis>

Redis Sets