conditional trigger in sqlite

cond_trigger.sqlite

DROP TABLE IF EXISTS tb1;
DROP TABLE IF EXISTS tb2;
DROP TABLE IF EXISTS ch;
CREATE TABLE tb1 (a INT, b TEXT);
INSERT INTO tb1 VALUES (1,'foo'),(2,'bar');
CREATE TABLE tb2 AS SELECT * FROM tb1;
CREATE TABLE ch (choice TEXT);

CREATE TRIGGER conditional_1 AFTER INSERT ON ch
WHEN new.choice = 'tb1'
BEGIN
    INSERT INTO tb1 VALUES (3,'THIS IS conditional_1 test');
END;

CREATE TRIGGER conditional_2 AFTER INSERT ON ch
WHEN new.choice = 'tb2'
BEGIN
    INSERT INTO tb2 VALUES (3,'THIS IS conditional_2 test');
END;