在单个SQL语句中插入“不知名”的多个值

Question

我想创建一个存储过程，以将多个值插入另一个表中的值的表中。 在创建MYSQL语句来帮助实现这一目标时，我感到头疼。

CREATE PROCEDURE `sp_loadIDs`()

BEGIN
declare vUserID int;

-- I know this should only return one value but dont know the work around for getting all values meeting this criterion
set vUserID = (select UserID from usertbl where DesignationID=1); 
insert into tasktbl (UserID,DefaultUser) values (vUserID,'1');

-- For known values, I know it is as easy as follows:
insert into tasktbl (UserID,DefaultUser) values ('21','1'),('22','1'),('23','1');
END

Answer 1

我认为，只要我正确理解了要求，即可满足您的需求

INSERT INTO tasktbl
            (UserId,
             DefaultUser)
(SELECT userid,
        '1' AS DefaultUser
 FROM   usertbl
 WHERE  DesignationID = 1);

根据OP的评论进行编辑：

INSERT INTO tasktbl
            (UserId)
(SELECT userid
 FROM   usertbl
 WHERE  DesignationID = 1);

Answer 2

也许您可以尝试“插入到...选择...从...中”，下面是一个示例

INSERT INTO tasktbl (UserID,DefaultUser)
SELECT UserID, DesignationID
FROM usertbl
WHERE DesignationID = 1