sdiffstore
SDIFFSTORE
Get the set difference and store it in a new set
Usage: sdiffstore destination_key source_key1 source_key2.
The behavior is the same as SDIFF. The extra part is storing the result set in the specified destination_key.
myset1 = { A, B, C }
myset2 = { B, D }
SDIFFSTORE dest_key myset1 myset2 = { A, C }
Example
| Command> | sadd myset1 A B C |
| Result> | 3 |
| Command> | sadd myset2 B D |
| Result> | 2 |
| Command> | sdiffstore dest_key myset1 myset2
|
| Result> | 2 |
| Command> | smembers dest_key
|
| Result> |
1) A
2) C
|
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Get the difference of three sets and store it
Usage: sdiffstore destination_key source_key1 source_key2 source_key3.
myset1 = { A, B, C }
myset2 = { B, D }
myset3 = { C, E }
SDIFFSTORE dest_key myset1 myset2 myset3 = { A }
There is no limit on the number of keys.
Example
| Command> | sadd myset3 C E |
| Result> | 2 |
| Command> | sdiff dest_key myset1 myset2 myset3
|
| Result> | 1 |
| Command> | smembers dest_key
|
| Result> |
1) A
|
A source key can be specified as the destination key
SDIFFSTORE myset1 myset1 myset2 myset3
The previous contents of myset1 are cleared, and the result is stored in myset1.
Example
| Command> | sdiffstore myset1 myset1 myset2 myset3
|
| Result> | 1 |
| Command> | smembers myset1
|
| Result> |
1) A
|
Syntax
SDIFFSTORE destination_key source_key [source_key ...]
- Available since version 1.0.0.
- Time complexity is O(N). N is the total number of members in the given sets.
Commands
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