MySQL和mybatis查询相关

0.mybatis的xml文件头 <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > <mapper namespace="me.gacl.da…

【mybatis】【mysql】mybatis查询mysql，group by分组查询报错：Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column

mybatis查询mysql,group by分组查询报错:Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column mysql版本是5.7 1.导致出错的sql语句是: <select id="findScNumByTime" parameterType="com.pisen.cloud.luna.ms.security.code.api.beans…

Mysql的子查询相关知识，少但是精

Mysql子查询概念分析: 根据相关性分: (1)不相关子查询:一条Sql语句中含有多条SELECT语句,先执行子查询,再执行外查询,子查询可对立运行关键字:(1)先子查询,再外查询 (2)可以对立运行,即可以单独运行子查询,对外查询不干扰 (2)相关子查询:子查询不能独立运行,并且先运行外查询,再运行子查询关键字:(1)先外查询,再子查询 (2)子查询不能独立运行例如: (1)不相关子查询 --查询[和CLARK同一部门且比他工资低的]雇员名字和工资. -- 第一步:先查询CLARK部…

Mybatis使用MySQL进行模糊查询时输入中文检索不到结果

Mybatis使用MySQL进行模糊查询时输入中文检索时,需要在jdbcURL后增加参数 ?useUnicode=true&characterEncoding=UTF-8…

myBatis查询报错 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

myBatis查询报错 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 <select id="selectList" parameterType="com.hanilucky.core.vo.Dep" resultMap="Base…