Question

我必须进行多次插入，但所有这些新记录都将具有从其他表中检索的相同字段：

INSERT INTO `user` (`id`, `name`, `surname`, `retrieved`) VALUES
(null, "A", "A", SELECT id from user_records where id = 1),
(null, "B", "B", SELECT id from user_records where id = 1),
(null, "C", "C", SELECT id from user_records where id = 1)...

如何在不执行每条记录的情况下插入此选择结果？

谢谢

Answer 1

你应该使用变量：

SET @VAR := SELECT id 
              FROM user_records 
             WHERE id = 1;

INSERT INTO `user` (`id`, `name`, `surname`, `retrieved`) 
VALUES
(null, "A", "A", @VAR),
(null, "B", "B", @VAR),
(null, "C", "C", @VAR)...

或

SELECT id INTO @VAR 
  FROM user_records 
 WHERE id = 1;

INSERT INTO `user` (`id`, `name`, `surname`, `retrieved`) 
VALUES
(null, "A", "A", @VAR),
(null, "B", "B", @VAR),
(null, "C", "C", @VAR)...

Answer 2

首先，声明并指定var

DECLARE user_id INT;
SET user_id = (SELECT id from user_records where id = 1);

然后，在插入查询中使用var

INSERT INTO `user` (`id`, `name`, `surname`, `retrieved`) VALUES
(null, "A", "A", user_id),
(null, "B", "B", user_id),
(null, "C", "C", user_id)

具有多行的Insert语句包括相同的选择字段

2 个答案: