ZCOUNTCount members with scores within the given bounds.
| Syntax | ZCOUNT key min max |
| Group | zset |
| Arity | 4 |
| Since | 1.0.0 |
| Flags | readonly |
| Complexity | O(log N) — two rank descents on the order-statistic tree bracket the score range; nothing is scanned |
| Redis compatibility | full |