mysql - 在单个 SQL 语句中插入多个非 "pre-known"的值

Question

我想创建一个存储过程，将多个值插入到一个表中，其中包含另一个表中的值。我对创建 MYSQL 语句来帮助实现这一目标感到头疼。

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

如果我正确理解了要求，我认为这将满足您的要求

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);