Edited trigger from my last paste.Syntax is for mysql and you can see what changed since old trigger at the bottom of paste.

DELIMITER $$
DROP TRIGGER IF EXISTS restrictive_trigger;
CREATE TRIGGER restrictive_trigger
AFTER INSERT ON test1
FOR EACH ROW
BEGIN
IF NEW.input <> 1000
AND
IF (NEW.input > 1000, 1,0)=0
AND
IF (NEW.input < 1000, 1,0)=0
THEN
INSERT INTO test3() VALUES
('NOT_ALLOWED',NOW(),USER());
END IF;
IF NEW.input IN
('q','w','e','r','t','y','u','i','o','p','l','k','j','h','g','f','d','s','a','z','x','c','v','b','n','m')
THEN
INSERT INTO test2() VALUES
('EMPTY','EMPTY','EMPTY','EMPTY');
END IF;
IF NEW.input = '0'
THEN
DELETE FROM test2 WHERE A LIKE 'EMPTY';
END IF;
IF NEW.input = '0'
THEN
INSERT INTO test3() VALUES
('LETTER_INSERTED',NOW(), USER());
END IF;
IF NEW.input > 1000
THEN
INSERT INTO test2() VALUES
('MORE_THAN_THOUSAND',new.input,'OKAY',NOW());
END IF;
IF NEW.input = 1000
THEN
INSERT INTO test2() VALUES
('ONE_THOUSAND',NEW.input,'OKAY',NOW());
END IF;
IF NEW.input < 1000
AND
IF (NEW.input <> 0, 1,0)=1
THEN
INSERT INTO test2() VALUES
('LESS_THAN_THOUSAND',NEW.input,'OKAY',NOW());
END IF;
IF NEW.input = '-1'
THEN
DELETE FROM TEST2 WHERE A LIKE 'EMPTY'
OR
A LIKE 'MORE_THAN_THOUSAND'
OR
A LIKE 'LESS_THAN_THOUSAND'
OR
A LIKE 'ONE_THOUSAND';
END IF;
IF NEW.input = '1'
THEN
DELETE FROM test2 WHERE B LIKE '1';
END IF;
IF NEW.input LIKE '1'
THEN
DELETE FROM test3 WHERE ERROR_TYPE LIKE 'LETTER_INSERTED';
END IF;
UPDATE test2 SET STATUS = 'OKAY*' WHERE A LIKE '1000000';
UPDATE test3 SET USER = 'ODBC@localhost(YES)' WHERE USER LIKE 'ODBC@localhost';
UPDATE test3 SET USER = 'Unknown' WHERE USER LIKE '_______________%';
END;
$$

If you insert into test1 value "-1" you clean table test2 and if you insert value "1" you clean test 3 table.