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ZMSCORE

Returns the scores associated with the specified members in the sorted set stored at the specified key.

Syntax​

ZMSCORE key member [member ...]

Parameters​

  • key: The name of the sorted set.
  • member: The member(s) whose scores are to be retrieved.

Details​

  • Available since: 6.2.0
  • Time complexity: O(N) where N is the number of members being requested.
  • ACL categories: @read, @sortedset, @fast

The ZMSCORE command returns the scores of the specified members in the sorted set stored at key. For every member that does not exist in the sorted set, a nil value is returned.

Examples​

Basic Usage​

Assume we have a sorted set called myzset with the following members:

ZADD myzset 1 "a" 2 "b" 3 "c"

To retrieve the scores of members "a" and "c":

ZMSCORE myzset "a" "c"

This will return:

1) "1"
2) "3"

Handling Non-Existent Members​

If you request the score of a member that does not exist:

ZMSCORE myzset "a" "d"

This will return:

1) "1"
2) (nil)

Edge Cases​

  • If the key does not exist, ZMSCORE returns an array of nil values for each member.
  • If a member does not exist in the sorted set, nil is returned for that member.
  • If the key exists but is not a sorted set, an error is returned.

RESP2/RESP3 Reply​

  • Array reply: list of scores for the specified members, with nil for members that do not exist.