mysql 条件复制表

-- 创建目标表
CREATE TABLE target_table (
    id INT PRIMARY KEY,
    name VARCHAR(255),
    age INT
);

-- 将源表中年龄大于30的数据复制到目标表
INSERT INTO target_table (id, name, age)
SELECT id, name, age FROM source_table WHERE age > 30;

-- 创建触发器
DELIMITER $$
CREATE TRIGGER after_source_table_insert
AFTER INSERT ON source_table
FOR EACH ROW
BEGIN
    IF NEW.age > 30 THEN
        INSERT INTO target_table (id, name, age) VALUES (NEW.id, NEW.name, NEW.age);
    END IF;
END$$
DELIMITER ;

-- 创建存储过程
DELIMITER $$
CREATE PROCEDURE copy_data()
BEGIN
    DECLARE done INT DEFAULT FALSE;
    DECLARE v_id INT;
    DECLARE v_name VARCHAR(255);
    DECLARE v_age INT;
    DECLARE cur CURSOR FOR SELECT id, name, age FROM source_table WHERE age > 30;
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

    OPEN cur;

    read_loop: LOOP
        FETCH cur INTO v_id, v_name, v_age;
        IF done THEN
            LEAVE read_loop;
        END IF;
        INSERT INTO target_table (id, name, age) VALUES (v_id, v_name, v_age);
    END LOOP;

    CLOSE cur;
END$$
DELIMITER ;

-- 调用存储过程
CALL copy_data();

START TRANSACTION;
INSERT INTO target_table (id, name, age)
SELECT id, name, age FROM source_table WHERE age > 30;
COMMIT;

ALTER TABLE target_table ADD UNIQUE (id);