ERROR 1064: SQL syntax - mysql

Question

i want to create a procedure in MySQL/MariaDB, but I get a syntax error which I do not understand.
DELIMITER $$
DROP PROCEDURE IF EXISTS proc_loop$$;
CREATE PROCEDURE proc_loop()
BEGIN
DECLARE i INT;
DECLARE j INT;
DECLARE n INT;
DECLARE c VARCHAR(3);
SET i = 1;
SET j = 1;
SELECT COUNT(*) INTO n FROM AnswerSets;
WHILE i < n DO
WHILE j < 89 DO
SELECT CONCAT("Q", j) INTO c;
INSERT INTO T_ANSWER_SET (U_ID, Q_ID, ANSWER) SELECT i, j, c FROM AnswerSets WHERE Id = i;
SET j = j + 1;
END WHILE;
SET i = i + 1;
END WHILE;
END$$;
DELIMITER ;
My error message:
ERROR 1064 (42000) at line 16: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ';
CREATE PROCEDURE proc_loop()
BEGIN
DECLARE i INT;
DECLARE j INT;
DECLARE n ' at line 1
Thanks in advance for help.

Answer 1

Try This:
DROP PROCEDURE IF EXISTS proc_loop;
DELIMITER $$
CREATE PROCEDURE `proc_loop`()
BEGIN
DECLARE i INT;
DECLARE j INT;
DECLARE n INT;
DECLARE c VARCHAR(3);
SET i = 1;
SET j = 1;
SELECT COUNT(*) INTO n FROM AnswerSets;
WHILE i < n DO
WHILE j < 89 DO
SELECT CONCAT("Q", j) INTO c;
INSERT INTO T_ANSWER_SET (U_ID, Q_ID, ANSWER) SELECT i, j, c FROM AnswerSets WHERE Id = i;
SET j = j + 1;
END WHILE;
SET i = i + 1;
END WHILE;
END$$
DELIMITER ;
Should that not work, as a means of debugging try removing all of the proc content in favor of something trivial like select 1; and see if the error persists. I've seen this error reported incorrectly before due to a slight syntax error in the proc body.
To debug the insert, temporarily comment out the insert into t_answer_set:
...
SELECT CONCAT("Q", j) INTO c;
-- INSERT INTO T_ANSWER_SET (U_ID, Q_ID, ANSWER)
SELECT i, j, c FROM AnswerSets WHERE Id = i;
...