ZADDAdd members with scores to a sorted set, with conditional flags.
| 構文 | ZADD key [NX|XX] [GT|LT] [CH] [INCR] score member [score member ...] |
| グループ | zset |
| 引数の数 | -4 |
| 導入バージョン | 1.0.0 |
| フラグ | write |
| 計算量 | O(M log N) — O(1) hash insert plus O(log N) tree insert per member |
| Redis 互換性 | full |