I can't seem to find any documentation on what the "$$" at the beginning and end of a function. Obviously, it seems like a delimiter, but I have seen examples such as where it has a string value between the $. Why? What does this do? I've done some searching and reading and can't quit figure it out.
Please see the following for the 8.3 online documentation:
CREATE FUNCTION emp_stamp() RETURNS trigger AS $emp_stamp$ <----note!
-- Check that empname and salary are given
IF NEW.empname IS NULL THEN
RAISE EXCEPTION 'empname cannot be null';
IF NEW.salary IS NULL THEN
RAISE EXCEPTION '% cannot have null salary', NEW.empname;
-- Who works for us when she must pay for it?
IF NEW.salary < 0 THEN
RAISE EXCEPTION '% cannot have a negative salary', NEW.empname;
-- Remember who changed the payroll when
NEW.last_date := current_timestamp;
NEW.last_user := current_user;
$emp_stamp$ LANGUAGE plpgsql;
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