```
CREATE TABLE table_test_trigger (
  id INT(11) NOT NULL AUTO_INCREMENT,
  a INT(11) DEFAULT NULL,
  b INT(11) DEFAULT NULL,
  c INT(11) DEFAULT NULL,
  PRIMARY KEY (id)
);

DELIMITER $$

CREATE TRIGGER trigger1
    BEFORE INSERT
    ON table_test_trigger
    FOR EACH ROW
BEGIN
  SET NEW.c = NEW.a + NEW.b;
END
$$

```

I've tried this code.

**Error:**

`#1064 - 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 '' at line 6`