Authors who have never commented
SQLMedium10 min
Your task
Find authors with no comments to their name. Return name, alphabetically.
Tables
author| idINTEGER | nameTEXT | countryTEXT |
|---|
| 1 | Nia | KE |
| 2 | Oz | AU |
| 3 | Pia | BR |
| 4 | Quin | NULL |
post| idINTEGER | author_idINTEGER | titleTEXT | published_onTEXT | viewsINTEGER |
|---|
| 1 | 1 | Indexes explained | 2026-01-10 | 4200 |
| 2 | 1 | Query plans | 2026-02-02 | 1800 |
| 3 | 2 | Vacuum and bloat | 2026-02-11 | 900 |
| 4 | 3 | Draft on locks | NULL | 0 |
| 5 | 2 | Replication lag | 2026-03-01 | 5300 |
comment| idINTEGER | post_idINTEGER | author_idINTEGER | bodyTEXT |
|---|
| 1 | 1 | 2 | Useful |
| 2 | 1 | 3 | Thanks |
| 3 | 1 | 2 | One more thing |
| 4 | 3 | 1 | Good write-up |
| 5 | 5 | 3 | Saved me |
Model answerRun