【MySql】NOT IN()失效
SELECT * FROM test WHERE number NOT IN (4,7,10)，数据库中有满足条件的数据，却一条也查不到。
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项目打包失败:could not be resolved: com.sun:tools:jar:1.8
maven打包项目失败报错：could not be resolved: com.sun🛠jar:1.8
SQl语句group by分组异常
执行SQl报错：Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column ’test.t1.name’ which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
Java判断int与Integer是否相等空指针异常
Exception in thread “main” java.lang.NullPointerException.
yum安装/更新软件失败
服务器用着好好的，yum install安装软件失败。