### General functions

| Name      | Parameters       | Return  | Description                                   |
| --------- | ---------------- | ------- | --------------------------------------------- |
| ISNULL    | ANY              | Boolean | Return TRUE if the argument type is null.     |
| ISNUMERIC | ANY              | Boolean | Return TRUE if the argument type is number.   |
| TYPEOF    | ANY              | Text    | Return the argument type name.                |
| GREATEST  | ANY, Any, ...Any | Any     | Return the greatest value from list of values |
| LEAST     | ANY, Any, ...Any | Any     | Return the smallest value from list of values |
| UUID      |                  | Text    | Return a Universal Unique Identifier          |
