| ID | Problem Show tags Hide tags | AC / Tried | Difficulty | |
|---|---|---|---|---|
| 509 | DEMC068 DE-MC-068 COUNT(*)与COUNT(col)主要区别? | 0 / 0 | 5 | |
| 589 | DEMC148 DE-MC-148 一张表有100行,金额列10行为NULL、另有5行金额为0。COUNT(*)与COUNT(金额)分别是? | 0 / 0 | 5 |
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