oracle function
CREATE OR REPLACE FUNCTION to_date_check_null(dateString IN VARCHAR2,
dateFormat IN VARCHAR2) RETURN DATE IS
BEGIN
IF dateString IS NULL THEN
return NULL;
ELSE
return to_date(dateString, dateFormat);
END IF;
END;syntax of function in oracle
CREATE [OR REPLACE] FUNCTION function_name
[ (parameter [,parameter]) ]
RETURN return_datatype
IS | AS
[declaration_section]
BEGIN
executable_section
[EXCEPTION
exception_section]
END [function_name];creating function in oracle
CREATE OR REPLACE Function FindCourse
( name_in IN varchar2 )
RETURN number
IS
cnumber number;
cursor c1 is
SELECT course_number
FROM courses_tbl
WHERE course_name = name_in;
BEGIN
open c1;
fetch c1 into cnumber;
if c1%notfound then
cnumber := 9999;
end if;
close c1;
RETURN cnumber;
EXCEPTION
WHEN OTHERS THEN
raise_application_error(-20001,'An error was encountered - '||SQLCODE||' -ERROR- '||SQLERRM);
END;Copyright © 2021 Codeinu
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