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];function pl sql with select
CREATE OR REPLACE FUNCTION get_total_sales(
in_year PLS_INTEGER
)
RETURN NUMBER
IS
l_total_sales NUMBER := 0;
BEGIN
-- get total sales
SELECT SUM(unit_price * quantity)
INTO l_total_sales
FROM order_items
INNER JOIN orders USING (order_id)
WHERE status = 'Shipped'
GROUP BY EXTRACT(YEAR FROM order_date)
HAVING EXTRACT(YEAR FROM order_date) = in_year;
-- return the total sales
RETURN l_total_sales;
END;Copyright © 2021 Codeinu
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