Set commands

These are the commands that are available for sets.

SADD <key> <member> [member ...]

Adds the members to the set stored at key.

If key does not exist, a new set is created before adding the specified members.

Example

> SADD myset hello
ok
 
> SADD myset world hi
ok

SMEMBERS <key> [key ...]

Returns all the members of the set value stored at key.

Example

> SMEMBERS myset
hello
world
hi

SREM <key> <member> [member ...]

Removes the specified members from the set stored at key.

Specified members that are not a member of this set are ignored.

Example

> SREM myset hello
ok
 
> SMEMBERS myset
world
hi

SCARD <key>

Returns the set cardinality (number of elements) of the set stored at key.

Example

> SCARD myset
2

SDIFF <key> [key ...]

Returns the members of the set resulting from the difference between the first set and all the successive sets.

Example

> SADD myset1 hello
ok
 
> SADD myset1 world
ok
 
> SADD myset2 hello
ok
 
> SDIFF myset1 myset2
world

SINTER <key> [key ...]

Returns the members of the set resulting from the intersection of all the given sets.

Example

> SADD myset1 hello
ok
 
> SADD myset1 world
ok
 
> SADD myset2 hello
ok
 
> SINTER myset1 myset2
hello

SISMEMBER <key> <member>

Returns if member is a member of the set stored at key.

Example

> SADD myset hello
ok
 
> SISMEMBER myset hello
1
 
> SISMEMBER myset world
0

SUNION <key> [key ...]

Returns the members of the set resulting from the union of all the given sets.

Example

> SADD myset1 hello
ok
 
> SADD myset1 world
ok
 
> SADD myset2 hello
ok
 
> SUNION myset1 myset2
hello
world