| ID | Problem Show tags Hide tags | AC / Tried | Difficulty | |
|---|---|---|---|---|
| 492 | DEMC051 DE-MC-051 源系统用NULL表示“尚未采集”,用0表示“实际为零”,清洗时应? | 0 / 0 | 5 | |
| 572 | DEMC131 DE-MC-131 源字段中NULL表示未知,数值0代表已确认无余额。计算平均余额前应? | 0 / 0 | 5 |
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