Storing MySQL query as function - mysql

Question

I'm new to MySQL functions. I Created a function:
CREATE FUNCTION `tems`.`<function_name>`(IN bid INT, IN cid INT)
RETURNS INT(10)
LANGUAGE SQL
NOT DETERMINISTIC
CONTAINS SQL
SQL SECURITY DEFINER
COMMENT ''
BEGIN
DECLARE min_no INT;
SELECT COALESCE(min(number),1)
FROM
(SELECT r1.number -1 AS number, r1.branch_id, r1.course_id
FROM `Room` AS r1
LEFT JOIN `Room` AS r2
ON r1.branch_id = r2.branch_id
AND r1.course_id = r2.course_id
AND (r1.number - 1) = r2.number
WHERE r1.number > 1 AND r2.number IS NULL
UNION ALL
SELECT max(number) + 1, branch_id, course_id
FROM `Room`
GROUP BY branch_id, course_id) AS q
WHERE branch_id=bid AND course_id=cid
GROUP BY branch_id, course_id
INTO min_no;
RETURN (min_no);
END;
And I want to get bid, cid and return the select value, but I'm getting an error message:
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'IN bid INT, IN cid INT)
RETURNS INT(10)
LANGUAGE SQL
NOT DETERMINISTIC
CONTAINS ' at line 1
What am I doing wrong?

Answer 1

Use a DELIMITER like below along with removing the two part identifier. Just declare the function name.
DELIMITER $$
CREATE FUNCTION MyTestFunc (bid INT, cid INT)
RETURNS INT(10)
LANGUAGE SQL
NOT DETERMINISTIC
CONTAINS SQL
SQL SECURITY DEFINER
COMMENT ''
BEGIN
DECLARE min_no INT;
SELECT COALESCE(min(number),1)
FROM
(SELECT r1.number -1 AS number, r1.branch_id, r1.course_id
FROM `Room` AS r1
LEFT JOIN `Room` AS r2
ON r1.branch_id = r2.branch_id
AND r1.course_id = r2.course_id
AND (r1.number - 1) = r2.number
WHERE r1.number > 1 AND r2.number IS NULL
UNION ALL
SELECT max(number) + 1, branch_id, course_id
FROM `Room`
GROUP BY branch_id, course_id) AS q
WHERE branch_id=bid AND course_id=cid
GROUP BY branch_id, course_id
INTO min_no;
RETURN (min_no);
END$$
DELIMITER ;