**当我执行此过程时，提示错误1064 **

Question

CREATE DEFINER=`root`@`localhost` PROCEDURE `GetStateList`(IN _CountryName VARCHAR(255))
BEGIN
    DECLARE @CCode VARCHAR(50)
SET @CCode = (SELECT CountryID  from countrylist where CountryName = _CountryName);
  SELECT @CCode;

END

Answer 1

您需要将定界符重新定义为$$以外的其他名称（例如：;）。最后，将限制器重置回;。另外，在Declare语句中缺少分号：

DELIMITER $$

CREATE DEFINER=`root`@`localhost` PROCEDURE `GetStateList`(IN _CountryName VARCHAR(255))

BEGIN
    DECLARE @CCode VARCHAR(50); -- semicolon was missing here
    SET @CCode = (SELECT CountryID  
                  from countrylist 
                  where CountryName = _CountryName);

    SELECT @CCode;

END$$

DELIMITER ;