SQL
`ADD COLUMN`
Add a new column with name `k` to the table `integers`, it will be filled with the default value NULL:  
```sql
ALTER TABLE integers ADD COLUMN k INTEGER;
```  
Add a new column with name `l` to the table integers, it will be filled with the default value 10:  
```sql
ALTER TABLE integers ADD COLUMN l INTEGER DEFAULT 10;
```  
The `ADD COLUMN` clause can be used to add a new column of a specified type to a table. The new column will be filled with the specified default value, or `NULL` if none is specified.