如何在MySQL中执行存储在变量中的查询？

我试图在sqlyog中执行查询，这些查询是

SET @adm_code = 12781;
SET @transfer = (SELECT MAX(id) FROM std_transfer_history AS sth
WHERE admission_code = @adm_code);
EXECUTE @transfer;

但它给出了一个错误

Query: execute @transfer

Error Code: 1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '@transfer' at line 1

Execution Time : 0 sec
Transfer Time  : 0 sec
Total Time     : 0 sec

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那么我如何才能摆脱……

您缺少执行动态查询的

prepare

语句

// your transfer variable query ...

PREPARE stmt FROM @transfer;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

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我建议检查与MySQL服务器版本对应的手册，以了解

EXECUTE

的正确语法。例如，对于MySQL 5.7，它将给出查询：EXECUTE stmt错误代码：1243未知的准备语句处理程序（stmt）给定执行时间：0秒传输时间：0秒总时间：0秒