报错内容:sql  1093 - You can't specify target table 'u' for update in FROM clause 错误原因: if you're doing an UPDATE/INSERT/DELETE on a table, you can't reference that table in an inner query 解决方法: (you can however reference a field from that outer table...…

特征1: hbase.client.RetriesExhaustedException: Can't get the locations 特征2: hbase日志报错如下:org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /hbase/hbaseid 特征3: unexpected error, closing socket connection a…

执行mysql命令查询时: select * from table_name错误信息如: [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 claus…

Update是T-sql中再简单不过的语句了,update table set column=expression  [where condition],我们都会用到.但update的用法不仅于此,真正在开发的时候,灵活恰当地使用update可以达到事半功倍的效果. 假定有表Table1(a,b,c)和Table2(a,c),现在Table1中有些记录字段c为null,要根据字段a在Table2中查找,取出字段a相等的字段c的值来更新Table1.一种常规的思路,通过游标遍历Table1中字段c…

/* 使用带关联子查询的Update更新     --1.创建测试表 create TABLE Table1     (     a varchar(10),     b varchar(10),     c varchar(10),     CONSTRAINT [PK_Table1] PRIMARY KEY CLUSTERED     (     a ASC     )     ) ON [PRIMARY] create TABLE Table2     (     a varchar(10…

开门见山: 这个误区是:子线程不能更新 UI ,其应该分类讨论,而不是绝对的. 半小时前,我的 XRecyclerView 群里面,一位群友私聊我,问题是: 为什么我的子线程更新了 UI 没报错? 我叫他发下代码我看,如下,十分简单的代码. @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activi…

今天1网友,查询报错ERROR: No query specified,随后它发来截图. root case:查询语法错误 \G后面不能再加分号;,由于\G在功能上等同于;,假设加了分号,那么就是;;(2个分号),SQL语法错误 备注:MySQL学习时.最好先去仔细致细.掌握基础:…

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…

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…

1.进入mysql命令行:#mysql -uroot -p123456,执行下面的命令开启慢查询报错: set global slow_query_log=on; set global long_query_time=1;#设置记录查询超过多长时间的sql set global slow_query_log_file='/opt/data/slow_query.log';#设置mysql慢查询日志路径 [y1]报错:ERROR 29 (HY000): File '/opt/data/slow_q…