redis commands sets sunionstore

SUNIONSTORE

Apply for Redis Developer Course	Redis Regular Inspection / Technical Support	Redis Enterprise Server

Store the union in a new set

Usage: sunionstore destination_key source_key1 source_key2.
The behavior is the same as SUNION, plus storing the result in destination_key.
myset1 = { A, B, C }
myset2 = { B, C, D }
SUNIONSTORE dest_key myset1 myset2 = { A, B, C, D }

Store the union of three sets

Usage: sunionstore dest_key key1 key2 key3.
myset1 = { A, B, C }
myset2 = { B, C, D }
myset3 = { C, E, F }
SUNIONSTORE dest_key myset1 myset2 myset3 = { A, B, C, D, E, F }
There is no limit on the number of source keys.
If the destination key already exists, its contents are overwritten with the new set.

A source key may also be the destination

SUNIONSTORE myset1 myset1 myset2 myset3
The previous contents of myset1 are replaced with the result.

Syntax

SUNIONSTORE destination_key source_key [source_key ...]

• Available since version 1.0.0.
• Time complexity is O(N), where N is the total number of members in the given sets.