Oracle Database PLSQL Error: PLS-00103 - oracle

Question

I'm writing simple function in Oracle Database 11g that count summary salary for employee. For this we need to count days with specific status. Days is present as fields in table (Day_1, Day_2, ..., Day_30).
But i have got error during compilation:
Error(50,9): PLS-00103: Encountered the symbol ";" when expecting one of the following: :=.(#%;
Code of my package (a place where there is an error marked in code of function f2):
CREATE OR REPLACE PACKAGE pack IS
FUNCTION f1 (id IN NUMBER) return t2 PIPELINED;
FUNCTION f2 (id IN NUMBER) return number;
end pack;
/
CREATE OR REPLACE PACKAGE BODY pack IS
FUNCTION f1 (id IN NUMBER) return t2 PIPELINED IS
name VARCHAR2(50);
num number;
BEGIN
FOR i IN 1 .. id LOOP
SELECT отдел
into name
from отдел
where ид_отдела = i;
select sum(КОЛИЧЕСТВО)
into num
from Таблица_3
join Таблица_2
on Таблица_3.КТО_ПРОДАЛ = Таблица_2.ЧЛВК_ИД
where отдел = i;
PIPE ROW( t1(i, name, num) );
END LOOP;
RETURN;
END f1;
FUNCTION f2 (id IN NUMBER) return NUMBER AS
WorkingDays NUMBER := 0;
CurrentDay VARCHAR2(50);
Salary NUMBER := 120;
Total NUMBER := 0;
BEGIN
FOR i IN 1 .. 30 LOOP
EXECUTE IMMEDIATE 'SELECT День_' || i || ' FROM Таблица_2 WHERE ЧЛВК_ИД = id INTO CurrentDay';
IF WorkingDays IN ('КОМАНДИРОВКА','ВЫХОДНОЙ','ПРАЗДНИК') THEN -- <--- Here
WorkingDays := WorkingDays + 1;
END IF;
END LOOP;
Total : = Salary * WorkingDays;
RETURN Total;
END f2;
end pack;
/
How can i solve this? Maybe the problem is in the logic of the program?

Answer 1

That is an error on parsing, and be aware that it often does not accurately show the error itself, but where the next symbol error occurred. For example:
declare
x number;
y number;
begin
if x = 1 then
y := 1 --I forget to put on the semi-colon to end the line
end if;
end;
You'd expect an error on the missing semi-colon. What you get is:
ORA-06550: line 7, column 2:
PLS-00103: Encountered the symbol "END" when expecting one of the following:
* & = - + ; < / > at in is mod remainder not rem
<an exponent (**)> <> or != or ~= >= <= <> and or like like2
like4 likec between || multiset member submultiset
The symbol ";" was substituted for "END" to continue.
Since in your comments you talk about changing things - perhaps to make it more readable for us (and thank you!), it may be obscuring the actual syntax glitch.
Two things I notice:
Total : = Salary * WorkingDays;
That has a space between the : and = that shouldn't be there
and:
FUNCTION f2 (id IN NUMBER) return NUMBER AS
which is normally
FUNCTION f2 (id IN NUMBER) return NUMBER IS