- as $$ ... $$: The function body is
a string. PL/pgSQL allows for quoting using:
- '...': But this is problematic for code
containing single quote marks, e.g. string literals.
- $$...$$
- language plpgsql: Specifies the language
of the code. (Remeber, the code is in a string.)
- begin ... end:
- Delimits the body of a function.
- No semicolons
- Inside the block, statements are terminated by semicolons.
- This is PL/pgSQL syntax. They have nothing to do with
transactions.
- The SQL statements begin and end (with
semi-colons in most contexts) are used to delimit transactions.
- return dollars * 1.2: The actual
function logic.