Vlak 9.8 van SQL Probleemoplossingsgids
Die volgende tabelle word gegee:
| id | title |
|---|---|
| 1 | Lorem ipsum |
| 2 | Lorem ipsum dolor sit amet |
| 3 | Lorem ipsum dolor sit |
| 4 | Lorem ipsum dolor |
| id | name |
|---|---|
| 1 | IT |
| 1 | PHP |
| 2 | JavaScript |
| 3 | React |
| 4 | Angular |
| 5 | Vue.js |
| 6 | C/C++ |
| 7 | Rust |
| id | post_id | tag_id |
|---|---|---|
| 1 | 1 | 1 |
| 2 | 1 | 2 |
| 3 | 1 | 3 |
| 4 | 1 | 4 |
| 5 | 1 | 5 |
| 6 | 2 | 7 |
| 7 | 2 | 6 |
| 8 | 2 | 5 |
| 9 | 2 | 4 |
| 10 | 2 | 3 |
| 11 | 3 | 2 |
| 12 | 3 | 7 |
| 13 | 3 | 5 |
| 14 | 3 | 6 |
| 15 | 4 | 5 |
| 16 | 4 | 1 |
| 17 | 4 | 7 |
| 18 | 4 | 6 |
Los die volgende probleme daarvoor op:
Vind die top-3 gewildste etikette volgens die aantal plasings wat elkeen bevat.
Vind die top-3 swakste etikette volgens die aantal plasings wat elkeen bevat.
