| ID | Problem Show tags Hide tags | AC / Tried | Difficulty | |
|---|---|---|---|---|
| 548 | DEMC107 DE-MC-107 4个值A、A、B、NULL,COUNT(DISTINCT col)为? | 0 / 0 | 2 | |
| 628 | DEMC187 DE-MC-187 值X、X、Y、Z、NULL,COUNT(DISTINCT col)为? | 0 / 0 | 2 |
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