对大家有帮助的问答会被标记为“推荐”,看完课程过来浏览一下别人提的问题,会帮你学得更全面
他拼接的格式为什么是'"+username+"',就他的双引号添加的不是很理解这个拼接
SELECT e.LAST_NAME,e.DEPARTMENT_ID
from employees e
WHERE e.DEPARTMENT_ID=(SELECT e1.DEPARTMENT_ID
from employees e1 where e1.last_name"Fox");
老师我这串代码哪里有问题呀
`userage` int(11) DEFAULT NULL,
PRIMARY KEY (`userid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
受影响的行: 0
时间: 0.010s
[Err] 1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column 'information_schema.PROFILING.SEQ' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
我在navicat添加外键输入mysql语句后报错
[Err] 1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column ‘information_schema.PROFILING.SEQ’ which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by,可是外键还是成功添加了,这是啥错误啊?