MySQL [Err] 1055 -Expression #

其他 2018-08-12 05:17:20 阅读次数: 0

今天一个朋友问我一条SQL语句，看是否可以优化，结果我执行了一遍，发现报错了。

错误的具体信息如下

经过分析发现是SQL_MODE的问题,因为在MySQL5.7中，SQL_MODE改为严格模式

查看MySQL的SQL_MODE

修改MySQL的配置文件,在配置文件中添加sql_mode

vi /etc/my.cnf

sql_mode = 'PIPES_AS_CONCAT,NO_ENGINE_SUBSTITUTION,NO_ZERO_DATE'

重启数据库，执行SQL

考虑是否可以优化此SQL

查看执行计划

p 表做了全表扫描

查看P表

P表执的时间也很慢，此SQL语句没有where条件，无法建立索引，所以无法优化。

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转载自blog.csdn.net/liuzhuang2017/article/details/81458195

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