ZRANKReturn a member's rank, ordered from the lowest score.
| 構文 | ZRANK key member |
| グループ | zset |
| 引数の数 | 3 |
| 導入バージョン | 1.0.0 |
| フラグ | readonly |
| 計算量 | O(log N) — a hash lookup for the score, then one descent of the rank-augmented (score, member) tree |
| Redis 互換性 | differs: the Redis 7.2 WITHSCORE option is not supported |