How to use GROUP function (MAX) in FUNCTION? - sql

Question

CREATE TABLE cursor_table(
emp_id NUMBER(10) PRIMARY KEY,
emp_name VARCHAR2(30),
emp_salary NUMBER(5)
);
INSERT INTO cursor_table VALUES(101,'addeesh',25000);
INSERT INTO cursor_table VALUES(102,'arunkumar',28000);
INSERT INTO cursor_table VALUES(103,'ashokkumar',35000);
INSERT INTO cursor_table VALUES(104,'durairaj',22000);
CREATE OR REPLACE FUNCTION high_payed_emp
RETURN NUMBER
IS
high_payed_emp_id NUMBER(10):=0;
DECLARE max_emp_salary = MAX(emp_salary);
BEGIN
SELECT emp_id INTO high_payed_emp_id
FROM cursor_table
WHERE emp_salary = max_emp_salary;
RETURN high_payed_emp_id;
END;
I need to create a function that will find the highest paid employee.
Error message: Encountered the symbol "DECLARE" when expecting one of the following: begin function pragma procedure subtype type current cursor delete exists prior

Answer 1

You need a SQL statement to use your MAX function.
CREATE OR REPLACE FUNCTION high_payed_emp
RETURN NUMBER
IS
high_payed_emp_id NUMBER(10):=0;
max_emp_salary NUMBER :=0;
BEGIN
SELECT MAX(emp_salary)
INTO max_emp_salary
FROM cursor_table;
SELECT emp_id INTO high_payed_emp_id
FROM cursor_table
WHERE emp_salary = max_emp_salary;
RETURN high_payed_emp_id;
END;

Answer 2

Please check the code below, you had both syntactical and logical errors.
CREATE OR REPLACE FUNCTION high_payed_emp
RETURN NUMBER
IS
high_payed_emp_id NUMBER(10):=0;
BEGIN
select emp_id
into high_payed_emp_id
from (
select emp_id
from cursor_Table
order by emp_salary desc
)
where rownum = 1;
RETURN high_payed_emp_id;
END;

Answer 3

Just use the subquery to compare max salary, your code should look like this:
CREATE OR REPLACE FUNCTION high_payed_emp
RETURN NUMBER
IS
high_payed_emp_id NUMBER(10);
BEGIN
SELECT emp_id INTO high_payed_emp_id
FROM cursor_table
WHERE emp_salary = (Select max(emp_salary) from cursor_table);
RETURN high_payed_emp_id;
END;
Execution:
Select high_payed_emp from dual;
OUTPUT:
HIGH_PAYED_EMP
--------------
103