ZRANKReturn a member's rank, ordered from the lowest score.
| Syntax | ZRANK key member |
| Group | zset |
| Arity | 3 |
| Since | 1.0.0 |
| Flags | readonly |
| Complexity | O(log N) — a hash lookup for the score, then one descent of the rank-augmented (score, member) tree |
| Redis compatibility | differs: the Redis 7.2 WITHSCORE option is not supported |