调用本机函数'concat'时参数不正确

Question

我正在尝试创建存储过程如下

CREATE PROCEDURE `Test1` (IN projName VARCHAR(200), IN tablName VARCHAR(200))
  BEGIN

  set @cmd = concat('Create table', tablName ' as ( select name from   samprojects.projects  where type=',projName')');

  PREPARE stmt FROM @cmd;
  EXECUTE stmt;

  END

低于错误

ERROR 1583：调用本机函数时参数不正确＆＃39; concat＆＃39;

知道如何解决这个问题。

我正在使用MYSQL工作台来运行sql查询

MYSQL工作台生成的SQL脚本如下

 USE `samprojects`;
 DROP procedure IF EXISTS `Test1`;

 DELIMITER $$
 USE `samprojects`$$
 CREATE PROCEDURE `Test1` (IN projName VARCHAR(200), IN tablName VARCHAR(200))
  BEGIN

  set @cmd = concat('Create table', tablName, ' as ( select name from   samprojects.projects  where type=',projName')');

  PREPARE stmt FROM @cmd;
  EXECUTE stmt;

  END$$

 DELIMITER ;

Answer 1

tablName之后您缺少逗号：

 set @cmd = concat('Create table', tablName, ' as ( select name from   samprojects.projects  where type=''',projName, ''')');