SQL
`DROP COLUMN`
Drop the column `k` from the table `integers`:  
```sql
ALTER TABLE integers DROP k;
```  
The `DROP COLUMN` clause can be used to remove a column from a table. Note that columns can only be removed if they do not have any indexes that rely on them. This includes any indexes created as part of a `PRIMARY KEY` or `UNIQUE` constraint. Columns that are part of multi-column check constraints cannot be dropped either.
If you attempt to drop a column with an index on it, DuckDB will return the following error message:  
```console
Dependency Error: Cannot alter entry "..." because there are entries that depend on it.
```