| Parameters | Does not accept parameters. | Accepts parameters. |
| Building Block | Can be used as a building block in larger queries. | Cannot be used as a building block in larger queries. |
| Content | Contains only a single SELECT query. | Can contain multiple statements like IF, ELSE, LOOP, etc. |
| Modification | Cannot perform modifications to any table. | Can perform modifications to one or more tables. |
| Query Target | Can sometimes be used as the target for INSERT, UPDATE, or DELETE. | Cannot be used as the target for INSERT, UPDATE, or DELETE. |