your MySQL server version for the right syntax to use near 'NULL' at line 1

本文介绍了如何解决在执行SQL语句时遇到的MySQL语法错误,提示'NULL'在第1行附近有误。通过检查MySQL服务器版本和手动修正语法,可以找到问题的解决方案。

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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 ‘NULL’ at line 1

    今天使用mysql事件执行一段程序,  
    set @deletesql =CONCAT('DELETE from classuserorder',' where a=',a);
    PREPARE stmt FROM @deletesql;
    EXECUTE stmt ; 
    DEALLOCATE PREPARE stmt;
    老是报异常,看错误应该是sql中有null,应该是concat拼接null后结果@deletesql为null,导致报错,对参数a做下判断即可
这个错误信息"check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line "是指在你MySQL语句中存在语错误,需要根据你的MySQL服务器版本来使用正确的语法。 这个错误通常发生在SQL语句的某一行的附近。具体的语法错误需要根据你的SQL语句来确定,可能是缺少了某个关键字、拼写错误、或者错误使用了某个符号。你可以参考MySQL的官方文档来查找正确的语法,并且确保你的SQL语句与你的MySQL服务器版本兼容。可以尝试使用调试工具来逐行检查你的SQL语句,找出错误所在并进行修正。<span class="em">1</span><span class="em">2</span><span class="em">3</span> #### 引用[.reference_title] - *1* [check the manual that corresponds to your MySQL server version for the right syntax to use near](https://blog.youkuaiyun.com/cdliker/article/details/106815722)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_1"}}] [.reference_item style="max-width: 33.333333333333336%"] - *2* [your MySQL server version for the right syntax to use near ‘(0) NOT NULL, `endTime` datetime(0) NO](https://download.youkuaiyun.com/download/weixin_38515573/13688019)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_1"}}] [.reference_item style="max-width: 33.333333333333336%"] - *3* [check the manual that corresponds to your MySQL server version for the right syntax to use near解决...](https://blog.youkuaiyun.com/qq_35623773/article/details/109752080)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_1"}}] [.reference_item style="max-width: 33.333333333333336%"] [ .reference_list ]
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