ZREM command in redis

ZREM key member

ZREM command in redis removes the specified member from the sorted set value stored at the key.

Note:

1. If a member was not a member of the set no operation is performed.

2. If the key does not hold a set value an error is returned.

TIME COMPLEXITY: O(log(N)) with N being the number of elements in the sorted set

RETURN VALUE: Integer reply, specifically:

1 if the new element was removed

0 if the new element was not a member of the set.

Syntax:

ZREM key member

Example 1: When the member is present

redis:6379> ZADD mykey 1 A 2 B 3 C 4 D 5 E
(integer) 5
redis:6379> ZREM mykey A
(integer) 1

Output

1

Example 2: When the member is not present

redis:6379> ZADD mykey 1 A 2 B 3 C 4 D 5 E
(integer) 5
redis:6379> ZREM myKey AA
(integer) 0

Output

0