Mysql 错误代码：1054。未知列'；逻辑删除标志'；在'；字段列表'；

虽然这里有许多问题与我现在遇到的问题相似，但我尝试过的答案不起作用。根据下表和触发器脚本，出现标题主题的原因和解决方案是什么

CREATE TABLE todolist (
    sequence_number INTEGER NOT NULL PRIMARY KEY AUTO_INCREMENT,
    to_do_item VARCHAR(45) NOT NULL,
    done_status BOOLEAN DEFAULT FALSE,
    active_flag BOOLEAN DEFAULT TRUE,
    last_action_code VARCHAR(45) NOT NULL,
    create_pid VARCHAR(45),
    create_datetime TIMESTAMP,
    read_pid VARCHAR(45),
    read_datetime TIMESTAMP,
    update_pid VARCHAR(45),
    update_timestamp TIMESTAMP,
    delete_pid VARCHAR(45),
    delete_timestamp TIMESTAMP,
    logical_delete_flag BOOLEAN DEFAULT FALSE
);

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SQL命令的顺序：

INSERT INTO todolist(to_do_item) VALUE ('Prepare for the assignment');
UPDATE todolist SET to_do_item = 'Check on how to start on the assignment' WHERE sequence_number = 1;

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然后，出现了错误。

您没有在更新之前的

触发器中使用
逻辑删除标记
周围的
旧的
或
新的
关键字。要访问受触发器影响的行中的列，需要根据场景使用以下关键字之一

对于您来说，您应该在要测试真/假的列周围使用
OLD

DELIMITER ;;
CREATE TRIGGER todolist_trigger_on_record_update
    BEFORE UPDATE ON todolist
    FOR EACH ROW
        BEGIN
            IF (OLD.logical_delete_flag IS TRUE) THEN
                SET NEW.delete_timestamp = NOW(),
                    NEW.delete_pid = 'todolist_trigger_on_record_logical_delete',
                    NEW.last_action_code = 'LOGICAL_DELETE';
            ELSE
                SET NEW.update_timestamp = NOW(),
                    NEW.update_pid = 'todolist_trigger_on_record_update',
                    NEW.last_action_code = 'UPDATE';
            END IF;
        END;;
DELIMITER ;

INSERT INTO todolist(to_do_item) VALUE ('Prepare for the assignment');
UPDATE todolist SET to_do_item = 'Check on how to start on the assignment' WHERE sequence_number = 1;

DELIMITER ;;
CREATE TRIGGER todolist_trigger_on_record_update
    BEFORE UPDATE ON todolist
    FOR EACH ROW
        BEGIN
            IF (OLD.logical_delete_flag IS TRUE) THEN
                SET NEW.delete_timestamp = NOW(),
                    NEW.delete_pid = 'todolist_trigger_on_record_logical_delete',
                    NEW.last_action_code = 'LOGICAL_DELETE';
            ELSE
                SET NEW.update_timestamp = NOW(),
                    NEW.update_pid = 'todolist_trigger_on_record_update',
                    NEW.last_action_code = 'UPDATE';
            END IF;
        END;;
DELIMITER ;