Sets are unordered collections of unique strings. Kora supports all standard Redis set operations.
SADD
Add one or more members to a set.
Syntax
SADD key member [member ...]
One or more members to add
The number of members that were added to the set (not including members already present)
redis-cli> SADD myset "Hello"
(integer) 1
redis-cli> SADD myset "World"
(integer) 1
redis-cli> SADD myset "World"
(integer) 0
redis-cli> SMEMBERS myset
1) "Hello"
2) "World"
SREM
Remove one or more members from a set.
Syntax
SREM key member [member ...]
One or more members to remove
The number of members that were removed from the set
redis-cli> SADD myset "one" "two" "three"
(integer) 3
redis-cli> SREM myset "one"
(integer) 1
redis-cli> SREM myset "four"
(integer) 0
redis-cli> SMEMBERS myset
1) "two"
2) "three"
SMEMBERS
Get all members of a set.
Syntax
Return value
Array of all members in the set
redis-cli> SADD myset "Hello" "World"
(integer) 2
redis-cli> SMEMBERS myset
1) "Hello"
2) "World"
SISMEMBER
Determine if a member exists in a set.
Syntax
Return value
1 if the member exists in the set, 0 otherwise
redis-cli> SADD myset "one"
(integer) 1
redis-cli> SISMEMBER myset "one"
(integer) 1
redis-cli> SISMEMBER myset "two"
(integer) 0
SCARD
Get the number of members in a set.
Syntax
Return value
The cardinality (number of members) of the set, or 0 if the key does not exist
redis-cli> SADD myset "Hello" "World"
(integer) 2
redis-cli> SCARD myset
(integer) 2
SPOP
Remove and return one or multiple random members from a set.
Syntax
Return value
Without count: a single member, or null if the set is empty. With count: array of popped members
redis-cli> SADD myset "one" "two" "three"
(integer) 3
redis-cli> SPOP myset
"two"
redis-cli> SMEMBERS myset
1) "one"
2) "three"
redis-cli> SPOP myset 2
1) "three"
2) "one"
SRANDMEMBER
Get one or multiple random members from a set.
Syntax
Number of members to return (negative values allow duplicates)
Without count: a single random member, or null if the set is empty. With count: array of random members
redis-cli> SADD myset "one" "two" "three"
(integer) 3
redis-cli> SRANDMEMBER myset
"one"
redis-cli> SRANDMEMBER myset 2
1) "three"
2) "two"
redis-cli> SRANDMEMBER myset -5
1) "one"
2) "two"
3) "three"
4) "one"
5) "two"
SUNION
Get the union of multiple sets.
Syntax
Return value
Array of members in the union
redis-cli> SADD set1 "a" "b" "c"
(integer) 3
redis-cli> SADD set2 "c" "d" "e"
(integer) 3
redis-cli> SUNION set1 set2
1) "a"
2) "b"
3) "c"
4) "d"
5) "e"
SUNIONSTORE
Store the union of multiple sets in a new set.
Syntax
SUNIONSTORE destination key [key ...]
The key where the result will be stored
One or more source set keys
The number of members in the resulting set
redis-cli> SADD set1 "a" "b" "c"
(integer) 3
redis-cli> SADD set2 "c" "d" "e"
(integer) 3
redis-cli> SUNIONSTORE out set1 set2
(integer) 5
redis-cli> SMEMBERS out
1) "a"
2) "b"
3) "c"
4) "d"
5) "e"
SINTER
Get the intersection of multiple sets.
Syntax
Return value
Array of members in the intersection
redis-cli> SADD set1 "a" "b" "c"
(integer) 3
redis-cli> SADD set2 "b" "c" "d"
(integer) 3
redis-cli> SINTER set1 set2
1) "b"
2) "c"
SINTERSTORE
Store the intersection of multiple sets in a new set.
Syntax
SINTERSTORE destination key [key ...]
The key where the result will be stored
One or more source set keys
The number of members in the resulting set
redis-cli> SADD set1 "a" "b" "c"
(integer) 3
redis-cli> SADD set2 "b" "c" "d"
(integer) 3
redis-cli> SINTERSTORE out set1 set2
(integer) 2
redis-cli> SMEMBERS out
1) "b"
2) "c"
SDIFF
Get the difference of multiple sets.
Syntax
One or more set keys (first key is the base set)
Array of members in the difference (members in the first set that are not in subsequent sets)
redis-cli> SADD set1 "a" "b" "c"
(integer) 3
redis-cli> SADD set2 "b" "c" "d"
(integer) 3
redis-cli> SDIFF set1 set2
1) "a"
SDIFFSTORE
Store the difference of multiple sets in a new set.
Syntax
SDIFFSTORE destination key [key ...]
The key where the result will be stored
One or more source set keys
The number of members in the resulting set
redis-cli> SADD set1 "a" "b" "c"
(integer) 3
redis-cli> SADD set2 "b" "c" "d"
(integer) 3
redis-cli> SDIFFSTORE out set1 set2
(integer) 1
redis-cli> SMEMBERS out
1) "a"
SINTERCARD
Get the cardinality of the intersection of multiple sets.
Syntax
SINTERCARD numkeys key [key ...] [LIMIT limit]
The number of keys to follow
Stop counting once this limit is reached
The cardinality of the intersection
redis-cli> SADD set1 "a" "b" "c" "d"
(integer) 4
redis-cli> SADD set2 "b" "c" "d" "e"
(integer) 4
redis-cli> SINTERCARD 2 set1 set2
(integer) 3
redis-cli> SINTERCARD 2 set1 set2 LIMIT 2
(integer) 2
SMOVE
Move a member from one set to another.
Syntax
SMOVE source destination member
1 if the member was moved, 0 if the member does not exist in the source set
redis-cli> SADD myset "one" "two"
(integer) 2
redis-cli> SADD myotherset "three"
(integer) 1
redis-cli> SMOVE myset myotherset "two"
(integer) 1
redis-cli> SMEMBERS myset
1) "one"
redis-cli> SMEMBERS myotherset
1) "two"
2) "three"
SMISMEMBER
Check if multiple members exist in a set.
Syntax
SMISMEMBER key member [member ...]
One or more members to check
Array of integers (1 if exists, 0 if not), one for each member in the same order
redis-cli> SADD myset "one" "two"
(integer) 2
redis-cli> SMISMEMBER myset "one" "two" "three"
1) (integer) 1
2) (integer) 1
3) (integer) 0
SSCAN
Incrementally iterate set members.
Syntax
SSCAN key cursor [MATCH pattern] [COUNT count]
The cursor position (use 0 to start)
Glob pattern to filter members
Hint for how many members to return
Array with two elements: [0] next cursor, [1] array of members
redis-cli> SADD myset a b c d e f
(integer) 6
redis-cli> SSCAN myset 0 MATCH a* COUNT 5
1) "0"
2) 1) "a"
Redis Compatibility
Kora implements all standard Redis set commands with identical semantics.