Configuration
Default Ordering for NULLs
Set the default ordering for NULLs to be either `NULLS_FIRST`, `NULLS_LAST`, `NULLS_FIRST_ON_ASC_LAST_ON_DESC` or `NULLS_LAST_ON_ASC_FIRST_ON_DESC`:  
```sql
SET default_null_order = 'NULLS_FIRST';
SET default_null_order = 'NULLS_LAST_ON_ASC_FIRST_ON_DESC';
```  
Set the default result set ordering direction to `ASCENDING` or `DESCENDING`:  
```sql
SET default_order = 'ASCENDING';
SET default_order = 'DESCENDING';
```