I have a table with 3 attributes

```
ARTICLE | CLAPS | STAMP
 -----  | ----- | ----
 RUST   |   1   | 2 OCT 2020 19:20
 C++    |   3   | 10 OCT 2020 12:30

```

I want to do these 3 queries on the table :

1. Check if the article name is taken
2. The article with highest number of claps
3. The most recent article

What is the most efficient way to query 2 and 3 without using a scan operation?