Error message in compliing a function

Question

Hi All,
I am trying to compiling the following function, but it is throwing the an error.
CREATE OR REPLACE FUNCTION parapage_discosessions
RETURN bumber
IS
discosessions number;
BEGIN
discosessions := select count(*) from gv$session where username IN ('DISCOFIELD', 'DISCOUSER','DISCOADMIN');
RETURN discosessions;
EXCEPTION
WHEN OTHERS THEN
raise_application_error(-20001,'An error was encountered - '||SQLCODE||' -ERROR- '||SQLERRM);
END;
The above function is giving the following error message
Error(9,21): PLS-00103: Encountered the symbol "SELECT" when expecting one of the following: ( - + case mod new not null <an identifier> <a double-quoted delimited-identifier> <a bind variable> avg count current exists max min prior sql stddev sum variance execute forall merge time timestamp interval date <a string literal with character set specification> <a number> <a single-quoted SQL string> pipe <an alternatively-quoted string literal with character set specification> <an alternatively-quo
Please give me any suggestions

Answer 1

SQL> CREATE OR REPLACE FUNCTION parapage_discosessions
  2  RETURN number IS
  3  discosessions number;
  4  BEGIN
  5  select count(*) into discosessions
  6  from gv$session
  7  where username IN ('DISCOFIELD', 'DISCOUSER','DISCOADMIN');
  8  RETURN discosessions;
  9  EXCEPTION
10  WHEN OTHERS THEN
11  raise_application_error(-20001,'An error was encountered - '||SQLCODE||' -ERROR- '||SQLERRM);
12  END;
13  /
Function created