SQL
Examples
Create a comment on a `TABLE`:  
```sql
COMMENT ON TABLE test_table IS 'very nice table';
```  
Create a comment on a `COLUMN`:  
```sql
COMMENT ON COLUMN test_table.test_table_column IS 'very nice column';
```  
Create a comment on a `VIEW`:  
```sql
COMMENT ON VIEW test_view IS 'very nice view';
```  
Create a comment on an `INDEX`:  
```sql
COMMENT ON INDEX test_index IS 'very nice index';
```  
Create a comment on a `SEQUENCE`:  
```sql
COMMENT ON SEQUENCE test_sequence IS 'very nice sequence';
```  
Create a comment on a `TYPE`:  
```sql
COMMENT ON TYPE test_type IS 'very nice type';
```  
Create a comment on a `MACRO`:  
```sql
COMMENT ON MACRO test_macro IS 'very nice macro';
```  
Create a comment on a `MACRO TABLE`:  
```sql
COMMENT ON MACRO TABLE test_table_macro IS 'very nice table macro';
```  
To unset a comment, set it to `NULL`, e.g.:  
```sql
COMMENT ON TABLE test_table IS NULL;
```