HPL/SQL compatibility with Oracle PL/SQL and SQL.
Oracle PL/SQL language elementes supported by HPL/SQL:
| TRUE and FALSE | Boolean literals |   | 0.3.13 | 
| -- comment | Single line comment |   | 0.1 | 
| /* comment */ | Multi line comment |   | 0.1 | 
| NOT NULL | Variable constraint | Parser only   | 0.3.13 | 
| CONSTANT | Constant variable |   | 0.3.13 | 
| := or DEFAULT | Default clause |   | 0.1 | 
| %TYPE | Data type attribute |   | 0.3.13 | 
| SUBTYPE subtype IS type | Subtype |   | |
Oracle PL/SQL data types supported by HPL/SQL:
Oracle PL/SQL operators and expressions supported by HPL/SQL:
| || Operaror | String concatenation |   | 0.1 | 
Oracle PL/SQL statements supported by HPL/SQL:
| := | Assignment statement |   | 0.1 | 
| CREATE FUNCTION | Create a user-defined function |   | 0.3.1 | 
| CREATE PACKAGE | Create a package |   | 0.3.13 | 
| CREATE PROCEDURE | Create a stored procedure |   | 0.3.1 | 
| NULL | No operation |   | 0.3.13 | 
| SELECT INTO | Assign values from query |   | 0.1 |